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langtags/doc/tagging.md at master · silnrsi/langtags · GitHub
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2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 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1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded 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Variation","anchor":"time-variation","htmlText":"Time Variation"},{"level":5,"text":"Stable Tagging","anchor":"stable-tagging","htmlText":"Stable Tagging"},{"level":3,"text":"Confirmation","anchor":"confirmation","htmlText":"Confirmation"},{"level":3,"text":"Regions","anchor":"regions","htmlText":"Regions"},{"level":3,"text":"Dialects","anchor":"dialects","htmlText":"Dialects"},{"level":3,"text":"Audio/Video","anchor":"audiovideo","htmlText":"Audio/Video"},{"level":3,"text":"Timing","anchor":"timing","htmlText":"Timing"},{"level":3,"text":"Macro languages","anchor":"macro-languages","htmlText":"Macro languages"},{"level":3,"text":"Deprecation","anchor":"deprecation","htmlText":"Deprecation"},{"level":3,"text":"Procedure","anchor":"procedure","htmlText":"Procedure"},{"level":2,"text":"Extra Information","anchor":"extra-information","htmlText":"Extra Information"},{"level":3,"text":"langtags.txt","anchor":"langtagstxt","htmlText":"langtags.txt"},{"level":2,"text":"Examples or FAQ","anchor":"examples-or-faq","htmlText":"Examples or FAQ"},{"level":3,"text":"Tai Dam","anchor":"tai-dam","htmlText":"Tai Dam"},{"level":3,"text":"Registry of Dialects","anchor":"registry-of-dialects","htmlText":"Registry of Dialects"},{"level":3,"text":"When to add a script","anchor":"when-to-add-a-script","htmlText":"When to add a script"},{"level":3,"text":"Macro Languages","anchor":"macro-languages-1","htmlText":"Macro Languages"}],"lineInfo":{"truncatedLoc":"728","truncatedSloc":"604"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/silnrsi/langtags/blob/master/doc/tagging.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/silnrsi/langtags/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/silnrsi/langtags/raw/refs/heads/master/doc/tagging.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLanguage Tagging\u003c/h1\u003e\u003ca id=\"user-content-language-tagging\" class=\"anchor\" aria-label=\"Permalink: Language Tagging\" href=\"#language-tagging\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOverview\u003c/h2\u003e\u003ca id=\"user-content-overview\" class=\"anchor\" aria-label=\"Permalink: Overview\" href=\"#overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA language tag may be as simple as the three-letter code for the language, or\nit may additionally include subtags to indicate the script used to write the\nlanguage (if more than one script is used) or the region of the world (country)\nwhere the language is used (if the orthography is different). In the vast\nmajority of cases, the three letter code is sufficient (for example, \"aak\" for\nAnkave, a language of Papua New Guinea, rather than \"aak-Latn-PG\" indicating\nthe Latin script and the country of PNG). Some languages, however, can be\nwritten with multiple scripts (for example, \"ahk\" for Akha, which can be\nwritten in Latin, Thai or Myanmar scripts) and need multiple language tags\n(\"ahk\" for the Latin case, but also \"ahk-Thai\" and \"ahk-Mymr\").\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA \"likely subtags\" list serves to \"fill in the blanks\", having entries that\nsupply script and region information for each language tag, for example:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003elang_id\u003c/th\u003e\n\u003cth\u003elikely_subtags\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eaak\u003c/td\u003e\n\u003ctd\u003eaak-Latn-PG\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk\u003c/td\u003e\n\u003ctd\u003eahk-Latn-MM\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-Mymr\u003c/td\u003e\n\u003ctd\u003eahk-Mymr-MM\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-Thai\u003c/td\u003e\n\u003ctd\u003eahk-Thai-TH\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-TH\u003c/td\u003e\n\u003ctd\u003eahk-Latn-TH\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eAs a language tag reviewer, you will be looking at language entries in your\nregion in order to:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003emake the language tag as short as possible without losing information\u003c/li\u003e\n\u003cli\u003eadd entries if additional script or region subtags are needed\u003c/li\u003e\n\u003cli\u003everify that the \"likely subtag\" contains the correct script and region\ninformation for the language tag\u003c/li\u003e\n\u003cli\u003eadd your initials in the confirmation column\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eMore details about these tasks are explained in the rest of this document. If\nat the end, you still have questions or things are unclear, please add a\ncomment and the authors will do their best to address it, either directly or by\nimproving the text.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntroduction\u003c/h2\u003e\u003ca id=\"user-content-introduction\" class=\"anchor\" aria-label=\"Permalink: Introduction\" href=\"#introduction\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA language tag is a string made up of subtags separated by -. The string can be\nused as an identifier to tag text in a language, or more precisely, a writing\nsystem.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStructure of a Language Tag\u003c/h3\u003e\u003ca id=\"user-content-structure-of-a-language-tag\" class=\"anchor\" aria-label=\"Permalink: Structure of a Language Tag\" href=\"#structure-of-a-language-tag\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere we describe the basic structure of a typical language tag. For the full\ndetails and the exceptions see \u003ca href=\"https://tools.ietf.org/html/bcp47\" rel=\"nofollow\"\u003e\u003cem\u003eBCP47\u003c/em\u003e\u003c/a\u003e.\nThe structure of a language tag is a sequence of subtags (or components) in\norder, separated by -. Only the first, language subtag, is required. All other\nsubtags are optional and are only required if they add distinguishing\ninformation that is needed to clarify the tag sufficiently to make it useful\nfor what the user is tagging. Yes, this is an ambiguous statement and most of\nthe rest of the document will address that ambiguity. The order and structure\nof each of the subtags is carefully controlled. Here is a tag showing the\nvarious subtags, even if none of them are right, it shows the structure:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"lng-Scrp-RE-variant-n-ext\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003elng-Scrp-RE-variant-n-ext\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile language tags are interpreted caseless, there is a convention regarding\ncasing. Taking each subtag in turn:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLanguage\u003c/strong\u003e. This is an ISO639 code. If a 2-letter code exists from\nISO639-1 or ISO639-2, then use that, else use the 3 letter code from\nISO639-3. The subtag is typically lowercase.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eScript\u003c/strong\u003e. This subtag identifies which script is being used. It is a 4\nletter code and comes from ISO15924. The subtag is typically title case\nwith the first letter upper case and the rest lowercase.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eRegion\u003c/strong\u003e. This subtag is used to indicate a writing system or language\nvariation based on the region. The region code is 2 letters and comes from\nISO3166-1 and is typically uppercase.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eVariant\u003c/strong\u003e. Variants are used to distinguish between dialects that share\nthe same language subtag, or orthography variants due to revisions, or\nanything else. The important thing about the variant (which is 5-11 chars and\ntypically lowercase) is that it has been registered with the language subtag\nregistrar. Private use variants can exist, but they are represented using an\nextension.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eExtension\u003c/strong\u003e. An extension is prefixed by a single letter namespace code\nfollowed by whatever subtags make sense within that namespace. There are a\nfew namespaces of interest:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e-u- is used by CLDR and ICU to identify processing parameters like\nwhich sort order to use or how linebreaking is done. See UTS#35 for\ndetails.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e-x- is the private use namespace. Anything after this namespace is\ntreated as private use and has no externally defined meaning. This is\nuseful for doing initial tagging before variants get registered.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThere is one other basic language tag structure and that is the private use\ntag. It simply starts with an x- and all subsequent subtags are private use.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLanguage Tag Examples\u003c/h3\u003e\u003ca id=\"user-content-language-tag-examples\" class=\"anchor\" aria-label=\"Permalink: Language Tag Examples\" href=\"#language-tag-examples\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere we look at some examples:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ahk\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eahk\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is a typical tag. It simply consists of a single ISO639-3 code. There is\nno need to provide any distinguishing information because there is no\nambiguity. Except in this case there is. So we may want to identify the script\nbeing used:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ahk-Latn\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eahk-Latn\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis tells us the text is in the Akha language using the Latin script. This is\nin contrast to the Thai or Burmese script orthographies.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ahk-fonipa\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eahk-fonipa\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis tag is common in analysis data. It says that the text is Akha and\nrepresented in the IPA. The fonipa variant implicitly implies that the script\nhas to be Latn and so no script subtag is required. Such analysis language tags\nare not represented in the language tag list because they are not used for\northographies, only for analysis. This does not reduce their validity, just the\nneed for any likely subtags associated with them.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhile the structure of a language tag is clearly defined, which subtags should\nbe present in any given situation is not. There is only one piece of community\nadvice regarding language tagging and that is \u003cem\u003etag wisely\u003c/em\u003e. What does this\nmean? While there are many cases where things can get complicated, there are a\nfew basic principles:\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNo Redundant Elements\u003c/h3\u003e\u003ca id=\"user-content-no-redundant-elements\" class=\"anchor\" aria-label=\"Permalink: No Redundant Elements\" href=\"#no-redundant-elements\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe basic principle is:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDo not add elements to a tag that do not add distinguishing information\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is not saying to minimise the tag, since we also need enough information\nin the tag to distinguish it from other tags of data in a different\northography. But it does mean that for 90% of tags, the tag can consist of just\na single ISO 639 initial element.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBut if a tag consists of just the language element, how is an application to\nknow what the script or region is for text tagged with just the language? A\ndefault region is important to provide good regional locale information. While\na default script may be analysable from the text, it is often preferable to\nhave knowledge of the intended script before processing the text.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTherefore, it would be helpful if there were some list that specified the\ndefault script and region for any given tag. The CLDR is managing one and calls\nthe default information the likely subtags for a given tag. SIL is keeping such\na list for the many language tags that it interacts with,\n\u003ca href=\"https://github.com/silnrsi/langtags\"\u003e\u003cem\u003ehere\u003c/em\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eManaging the Language Tags list\u003c/h2\u003e\u003ca id=\"user-content-managing-the-language-tags-list\" class=\"anchor\" aria-label=\"Permalink: Managing the Language Tags list\" href=\"#managing-the-language-tags-list\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe purpose of the SIL Language Tags list is to come up with helpful likely\nsubtags for any given tag and to know who can act as a point of reference\nregarding a tag in the list. The data originates from the Ethnologue and\nperiodically some resolution will take place, but the list is not master of the\nEthnologue, while it does provide some information the Ethnologue may not have.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNotice that this project does not add language tags for new languages. It\nentirely bases its information on existing standards, but adds value by bringing\nthose standards together for specific orthographies and writing systems. If\nthere is a need for a new language to be added to the ISO 639 standard then an\napplication needs to be made to the ISO 639-3 registrar. On the other hand if\nthere is a need for a new language tag for a particular orthography variant in a\nlanguage then application may be made through raising issues on this project\nrepository.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEasy Case\u003c/h3\u003e\u003ca id=\"user-content-easy-case\" class=\"anchor\" aria-label=\"Permalink: Easy Case\" href=\"#easy-case\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe easy case is where a language group has no dialects, is found in one\nprimary region and uses only one script and orthography. This is most cases.\nConsider aak, Ankave, a language of Papua New Guinea. Given its location, it is\nhighly unlikely that the likely subtags for the orthography for this language\nwill be anything other than aak-Latn-PG. And the basic tag need be nothing\nother than aak. In checking this, someone would ensure that the Lang_id field\nis simply aak and the likely_subtag is aak-Latn-PG. Once that is done, the\nperson would add their registered initials in the confirmed column. More than\none person can confirm the same row and thus if anyone wants to change\ninformation on that row, they should build consensus with anyone else in the\nconfirmed cell.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt may be that the Lang_id field has a script subtag in it which is entirely\nredundant. This is to be expected. When the data was exported from the\nEthnologue, script subtags were left in, even though they could have been\nreasonably removed. The decision was to act conservatively and encourage\nconfirmers to check their data and remove redundant subtags rather than needing\nto add them back in.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat about other scripts?\u003c/h4\u003e\u003ca id=\"user-content-what-about-other-scripts\" class=\"anchor\" aria-label=\"Permalink: What about other scripts?\" href=\"#what-about-other-scripts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe aim here is to tag orthographies. Thus while linguists may use other\nscripts to represent text in the language (for example, Latin romanisations for\nnon-Roman based orthographies), there is not expected to be any community\nstandardisation of these romanisations. Therefore there is no need to add an\nentry for them. This is particularly true for the -fonipa variant which may be\nused on any language and implies Latn script. On the other hand, if there is a\nlarge community and a standardised romanisation for a writing system, then it\nmay be worth listing the other script, even if it is only used for analysis.\nFor example, polytonic Greek or Hebrew. The issue of languages with multiple\nestablished orthographies in multiple scripts is covered later.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe Zyyy script is inserted into tags for which there is no known script. If\nyou know better, please replace Zyyy with the known script, even if it is Qaax\n(the script tag for “unwritten”).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt is possible to tag audio, although we use a private use variant for this:\n-x-audio. This allows audio text to be treated as just another representation\nof a language.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMultiple Regions\u003c/h4\u003e\u003ca id=\"user-content-multiple-regions\" class=\"anchor\" aria-label=\"Permalink: Multiple Regions\" href=\"#multiple-regions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhat if a language is used in multiple countries? The key question is whether\nthe orthography changes in the other country? If it does, then there should be\nanother full entry for the other orthography. The question then remains as to\nwhich country is the default region for the basic tag. For the most part, this\nis clear. But where it is not, then there may need to be no simple tag and\nthere needs to be one or more tags each with a region subtag.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhat about the list of regions associated with a tag? This list is intended to\ngive the possible range of values that the region subtag for a given tag, can\ntake. A country should only be listed if there is an established community of\nusers of the orthography settled there (or regularly passing through for\nnomadic groups). This does not include expatriate or diaspora groups. For\nexample, there are speakers of many languages in the world living in London,\nbut that does not mean that there needs to be a -GB type tag for every\nlanguage.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUnwritten Languages\u003c/h4\u003e\u003ca id=\"user-content-unwritten-languages\" class=\"anchor\" aria-label=\"Permalink: Unwritten Languages\" href=\"#unwritten-languages\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt is possible, often, to predict what the language tag will be for an\nunwritten language. If a confirmer is confident of their prediction, then\nplease feel free to add the tag entry preemptively. But it helps if the fact\nthat the language is currently unwritten can be recorded (in the \"unwritten\"\ncolumn). If there is any ambiguity, for example, there is any probability that\na language in a Latin script area may end up being written in Arabic script,\nthen do not add a script preemptively. Instead use the Qaax script tag to\nindicate that the language is as yet unwritten.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMultiple Scripts\u003c/h3\u003e\u003ca id=\"user-content-multiple-scripts\" class=\"anchor\" aria-label=\"Permalink: Multiple Scripts\" href=\"#multiple-scripts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe next most complex situation is where a language is written using different\nscripts. In most cases, there is still a primary default script used for a\nlanguage and so an entry can be made for the language and the likely_subtag\ncan be set to the default script and region. Then for the other scripts, new\nrows can be added, one per script.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn the past, it was felt that region drove script: one used Thai script in\nThailand and Khmer script in Cambodia, and therefore the disambiguating\ninformation was the region. The problem is that it doesn't tell you what script\nsomeone in London will use. For this reason, we record script as taking\npriority over region. Enough information is recorded that either approach can\nbe taken, so there is no danger.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor a complex example, consider ahk, Akha. Here is how it is listed in the\nlanguage tag list:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003elang_id\u003c/th\u003e\n\u003cth\u003elikely_subtags\u003c/th\u003e\n\u003cth\u003eregions\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk\u003c/td\u003e\n\u003ctd\u003eahk-Latn-MM\u003c/td\u003e\n\u003ctd\u003eCN MM TH\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-Mymr\u003c/td\u003e\n\u003ctd\u003eahk-Mymr-MM\u003c/td\u003e\n\u003ctd\u003eMM\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-Thai\u003c/td\u003e\n\u003ctd\u003eahk-Thai-TH\u003c/td\u003e\n\u003ctd\u003eTH\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eahk-TH\u003c/td\u003e\n\u003ctd\u003eahk-Latn-TH\u003c/td\u003e\n\u003ctd\u003eTH\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eIt can be written in Latn, Thai and Mymr scripts. For the most part it is\nwritten in Latn script and that is what is the default script for ahk. But\nthere are also entries for the other scripts. The default region is listed for\neach script along with all the regions in which there is an established user\ngroup.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhether there should be an extra entry for ahk-TH depends on what the default\nscript is in Thailand. If the default script is Thai, then there is no need for\nan extra entry since the default region for ahk-Thai is TH and therefore, the\ndefault script for ahk-TH is ahk-Thai-TH. But the default script is Latn, and\nwe need an entry to resolve the ambiguity and we add ahk-TH as ahk-Latn-TH. For\nahk-MM there are two likely subtags with a region of MM and the default will be\ntaken as the shorter, i.e. ahk-Latn-MM.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere is one more region of note for ahk and that is CN. CN only occurs in the\nlist of regions for ahk and therefore ahk-CN is equivalent to ahk-Latn-CN.\nThere is no need for an extra entry.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDeciding what the default script for a language is, is probably more political\nthan linguistic. This isn't a question of whether one script is used by 51% of\nthe population and another by 49%, so picking the winner. The aim is to answer\nthe question: if I just see the language code as the tag, which script should I\nassume is being used? In some cases (for example where there are 2 large\ncommunities using different scripts), it may not be possible to come up with a\ndefault. In which case, don't set one. Just list an entry for each of the\nscripts and not one for the language without a script.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMultiple Orthographies\u003c/h3\u003e\u003ca id=\"user-content-multiple-orthographies\" class=\"anchor\" aria-label=\"Permalink: Multiple Orthographies\" href=\"#multiple-orthographies\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn addition to the multi-script situation, there are a number of reasons why a\nlanguage can end up with multiple orthographies and we discuss some of them\nhere.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRegional Variation\u003c/h4\u003e\u003ca id=\"user-content-regional-variation\" class=\"anchor\" aria-label=\"Permalink: Regional Variation\" href=\"#regional-variation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSometimes a different country uses a different orthography, even though it is\nthe same script as another country. For example, Zaiwa (atb) is written in\nLatin script. The orthography used in Burma is different to that in China. In\nthis case, we simply acknowledge the fact that atb-MM is different from atb-CN.\nWe would have two entries in the database for the two regions, whether or not\none of them is the default.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCompeting Variations\u003c/h4\u003e\u003ca id=\"user-content-competing-variations\" class=\"anchor\" aria-label=\"Permalink: Competing Variations\" href=\"#competing-variations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn situations where no orthography has become dominant, for a relatively large\nor disparate language group, different orthographies can emerge and become\npopular in different regions. Those regions may overlap and not be identifiable\nusing a region tag. In this case, or for whatever reason there are multiple\nestablished orthographies for a language, we can use a variant to mark the\ndifferent orthographies. That still leaves the question of whether one is\nconsidered the default, and that can be a highly political question. It may be\nwisest not to specify a default variant for a language in that case and just to\nlist them all as being equal and required. In politically charged situations\nlike this, the variant tags need to be carefully chosen as needed by the\nsituation. There are no a priori limitations or requirements on private use\ntags. For standardised tags, there are structural limits as specified in BCP\n47.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTime Variation\u003c/h4\u003e\u003ca id=\"user-content-time-variation\" class=\"anchor\" aria-label=\"Permalink: Time Variation\" href=\"#time-variation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is probably the most complex tagging issue to address. As an example,\nconsider the case of German. It underwent an orthography change in 1996. So now\nthere is the pre-1996 orthography, or traditional German, and the post 1996\northography. To indicate these two orthographies, there are two variants: -1901\n(for traditional German) and -1996 for modern German. This allows someone to\nspecify precisely which orthography they are talking about, either de-1901 or\nde-1996. But what about simple de? Users want de to refer to the default\nstandard orthography, which is the modern post 1996 one. At some point,\ntherefore, de needs to switch its default mapping from de-1901 (which didn't\nactually exist when de was created) to de-1996.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMoving forward to the present day. If a language is undergoing an orthography\nchange, then you will want the default orthography for the tag to refer to the\nnew standard orthography. The question is whether you want to have a tag for\nthe old orthography. For orthographies in development, the answer is probably\nno. Just move on and drop the past, either by updating the data to the new\northography or acknowledge that the data is now defunct. In the case where the\nold orthography was established enough that data in it needs to be kept, then\nthere is a problem. We can create a variant for it, but the old data needs to\nbe retagged at some point if it is not to be confused with the modern\northography. Of course we can also keep it with its old tag and just\nacknowledge the ambiguity. In such a case, it is probable that a variant will\nbe needed for the new orthography, just so that a very clear contrast can be\nmade. See the Example for Tai Dam later in this document for a worked example.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStable Tagging\u003c/h5\u003e\u003ca id=\"user-content-stable-tagging\" class=\"anchor\" aria-label=\"Permalink: Stable Tagging\" href=\"#stable-tagging\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor those wanting stable tags, how can they deal with orthography changes?\nLet's consider the example of de. The year is 1990 and there is only one tag\nfor German: de. All data is tagged de. There are no variants and life is\nsimple. Time passes and it is now 1997. The government has passed the new\northography and as a result two new tags have been created to indicate the two\northographies: de-1901 and de-1996. From now on, the simple de tag is\nequivalent to de-1996. But all the data we have tagged as de is referring to\nde-1901. If, in our data repository, we follow a policy of stable language\ntagging, then whenever there is an orthography variant that can be used, it is\nused. This means that in 1997 any new data will be tagged de-1996 and never as\nde. This means that we can interpret de as de-1901 and probably retag it at the\nfirst opportunity. But at least we know what things mean. What is needed for\nthis is a mapping from stable ambiguous tags to stable tags. I.e. when we know\nthat the old orthography is de-1901, we record that and now know what de means,\nbecause using a stable tagging policy we will never tag data in the new\northography as de.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA stable tagging policy is very attractive, but doesn't fit with the rest of\nthe industry that says that de means de-1996. Therefore, stable tagging is best\nused temporarily. While the stable and unstable tags are the same, there is no\nproblem. But when an orthography revision occurs, it is best for data held\nwithin a stable tagging environment to be retagged with an unambiguous tag as\nsoon as possible. Then there is no problem and the data can be tagged unstably\nfrom then on.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA classic example of wanting stable tagging is archiving. Here, only stable\ntags should be used and if an orthography revision occurs, ambiguously tagged\ndata should be retagged and the ambiguous tag never used from then on.\nThankfully, retagging can be an automated process. The key is knowing when\nsomething was tagged. If we know that something was tagged before the tag was\nsplit (or changed), then we know what it means in the new tagging regime for\nthe orthography. One problem an archive can face is that for emerging\northographies, there can be many changes made to an orthography before it\nstabilises. Again, the date of entry into the archive is key. It is unlikely\nthat anyone will want to come up with variants for all the provisional\northographies. It might be worth introducing a variant that says that a\nparticular data set isn't precisely in the orthography as specified by the non\nvariant tag. But greater precision than that is probably unwarranted. This just\ngoes to show that language tagging isn't perfect.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe moral of the story: don't change your orthography! Well don't change it\nonce it's become well established. But if you have to, there are ways it can be\ndone, but they are not cost free.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConfirmation\u003c/h3\u003e\u003ca id=\"user-content-confirmation\" class=\"anchor\" aria-label=\"Permalink: Confirmation\" href=\"#confirmation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe next most important column is the confirmed field which contains a list of\ninitials of people who have expressed an interest in a row. If you have edited\nor reviewed a row (would have edited it, but it was correct already) then you\nshould add your initials there. For those in sensitive areas, the initials do\nnot actually have to be yours and you can put someone else's email address in\nthe list of contacts (with their permission) and they can act as the contact\nfor you. Thus many initials can refer to the same email.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn important set of initials are those of the CLDR. Any row with CLDR in the\nconfirmed field is highlighted in red and italicised to warn people not to just\nedit it. Any changes to the lang_id and likely_subtag fields must be agreed\nwith the CLDR technical committee first. Notice that other columns, including\nthe regions list, may be edited and your initials added.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRegions\u003c/h3\u003e\u003ca id=\"user-content-regions\" class=\"anchor\" aria-label=\"Permalink: Regions\" href=\"#regions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe regions list, as has been mentioned before, contains a list of all the\ncountries in which there is an established user community of the orthography.\nThe list does not need to include expatriate communities, for example in the UK\nor USA, although if those communities are big or established enough and are\nrecognised as such, by the host country, then it is worth adding them. The\nregions list is used to resolve the question what script is used for a\nlanguage-REGION pair. If there is any ambiguity, then it may be necessary to\nadd an explicit language-REGION row to resolve the script question. But where a\nregion is the default region for the correct script of that region, and is not\nthe default region for any other script, then there is no need for an explicit\nentry.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDialects\u003c/h3\u003e\u003ca id=\"user-content-dialects\" class=\"anchor\" aria-label=\"Permalink: Dialects\" href=\"#dialects\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn many cases whether a language variety is a dialect of another language or a\nseparate language, is clear. In language tagging terms, a dialect is considered\na variant of a language and the tag receives a variant to account for that. But\nvariants may be used for other things including different orthographies of a\nlanguage or dialect. In fact, there is nothing that says a language variant has\nto be mutually comprehensible with the non-variant language. As such, language\ntags allow for non mutually intelligible dialects. While this does not make\nlinguistic sense, it can make very good socio-political sense. If a language\ngroup considers itself part of another language group, it may be more\nappropriate to treat as a language variant of the main group rather than give\nit its own iso639 code, despite what the linguistics might say.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBCP 47 describes how language variants are tagged. There are a number of ways\npertinent to a dialect:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eA registered variant subtag (5-11 chars long), registered under the\nlanguage with the IETF.\u003c/li\u003e\n\u003cli\u003eA regional variant, identified through the regional subtag.\u003c/li\u003e\n\u003cli\u003eA private use variant under the x- namespace.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eRegional variation is exactly the same issue as for regional orthographic\ndifferences. If a dialect is identified with and primarily bound by a country,\nthen the best way to mark the dialect is through the region subtag. For\nexample, Singlish is a dialect of English spoken in Singapore and it might be\ntagged en-SG. (Although due to its low prestige, people may not want to\nidentify Singlish as the local form of English). There are lexical and\ngrammatical differences. Contrast this with en-CA, Canadian English, whose only\ndifference from British English (or strictly, International English - en-001)\nis some calendar differences. A language tag is not constrained by the amount\nof difference between variants. The only thing that is important is whether you\ncan fall back by trimming subtags. Is it acceptable to fall back from en-SG or\nen-CA? See BCP 47 for more details on this.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOne problem with dialects is akin to that of identifying languages. How does\none know how the dialects are to be grouped or separated? Do we mark each\nvillage as being its own dialect? This cuts to the heart of what a language tag\nis. It is a way of identifying two sets of data as being of the same language\nvariety. Therefore a language tag is only of value to a user community. If\nthere is no user community for the tag, then there is little point in having\nthe tag. Further, if a tag is only used by a very small community, who are all\nin contact with each other, then there is no real need for a standardised tag.\nIt is only as the user community grows that standardisation is needed. So while\na tag is only used by a small number of users, it is perfectly adequate to use\nprivate use subtags. While data is being analysed, then tagging to the village\nlevel is fine. It is only once a dialect needs to be tagged more widely that it\nneeds to be standardised.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA further problem is that while every effort may be made to keep language\ntagging from being political, it is often interpreted that way. How dialect\ngroups consider themselves or other groups can get complicated quickly. As\nstated above, the primary subcategorising of language tags is the ability to\nfall back to a simpler tag (the tag with the rightmost subtag removed). But\nthere also needs to be a consensus among the users of a language tag of what\nthe tag should be. This agreement includes appropriateness. One of the\ndifficulties is that there needs to be a language variety that is the\nnon-variant language. But it may not be possible to choose one. One approach is\nto, in effect, invent a dialect that is the most accessible given all the\ndialects will fall back to it. But this is far from ideal. Another option is to\nmake the unmarked language empty. This makes more sense in theory, but may be\npragmatically more frustrating. But at that point, agreed common elements can\nbe transferred from all the dialects into the language.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBut it may be that all this discussion of variants does not help a particular\nlanguage. It really is a different language and it really needs an ISO-639 code\nso that it can be tagged. In that case, an important part of developing a tag\nis deciding on the language part of the tag. Information on how to apply for a\niso 639-3 code can be found\n\u003ca href=\"http://www-01.sil.org/iso639-3/submit_changes.asp#Submitting\" rel=\"nofollow\"\u003e\u003cem\u003ehere\u003c/em\u003e\u003c/a\u003e. The\nprocess can be quite slow and so those thinking whether they need to apply are\nencouraged to do so earlier rather than later.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAudio/Video\u003c/h3\u003e\u003ca id=\"user-content-audiovideo\" class=\"anchor\" aria-label=\"Permalink: Audio/Video\" href=\"#audiovideo\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eLanguage tags were originally envisaged for marking text. The need to mark\nnon-textual media has grown, and thankfully there is a script tag for such\ndata: Zxxx. One convention has grown up for marking audio data using\n-Zxxx-x-audio. But strictly speaking the -x-audio is unnecessary since for\nwritten text, the assumption is that the unwritten form will be audio. The key\nexception to this is sign languages, where the default clearly needs to be\nvideo (-Zxxx-x-video). But a simple tag involving Zxxx is insufficient to tell\nan application what the tagged data actually is. There is the whole encoding\nquestion (including container formats and codecs) which calls for extra\ninformation somewhere. While this could be encoded in the language tag, it is\nmore easily handled as extra meta-data. It is unhelpful to encumber a language\ntag with encoding information since the tag may be used to tag different sets\nof data, differently encoded and then tag matching will fail.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOn this basis, any information in the -x- such as -x-audio can only be\nconsidered advisory and should not be keyed off to define whether an element is\naudio or video. The data encoding information tells whether it is audio or\nvideo. If there is a context where both audio and video data sets are present\nfor the same language, an -x- subtag can be used to add some differentiation,\njust to make the two tags different in some way.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTiming\u003c/h3\u003e\u003ca id=\"user-content-timing\" class=\"anchor\" aria-label=\"Permalink: Timing\" href=\"#timing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe good news in all this complexity is that time is on our side. It is\npossible to wait and to see how things will work out. Standardisation struggles\nwith change and it can be costly. It is often better to wait until things\nstabilize so that the resulting tags will last. We do not want to have the\nmeaning of a tag to change, otherwise previously tagged data needs to be\nretagged.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMacro languages\u003c/h3\u003e\u003ca id=\"user-content-macro-languages\" class=\"anchor\" aria-label=\"Permalink: Macro languages\" href=\"#macro-languages\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSome language tags are best not used and alternative used instead. This is\nindicated by specifying the basic tag to use instead, in the \u003ccode\u003emacro\u003c/code\u003e field.\nThis replacement may occur for different reasons, but the default is because\nthis language is the default language for a macro language group and the\nmacro language should be used instead.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDeprecation\u003c/h3\u003e\u003ca id=\"user-content-deprecation\" class=\"anchor\" aria-label=\"Permalink: Deprecation\" href=\"#deprecation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf a tag has to be withdrawn or changes significantly then the tag is not deleted\nbut it marked as deprecated and the \u003ccode\u003emacro\u003c/code\u003e field used to indicate which tag is to\nbe used instead. This way a system can now how to handle a withdrawn tag later.\nIn effect a deprecated tag is a special case of a macro language type tag.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProcedure\u003c/h3\u003e\u003ca id=\"user-content-procedure\" class=\"anchor\" aria-label=\"Permalink: Procedure\" href=\"#procedure\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHaving walked through all the issues involved in tagging, this section gives an\noverview procedure for reviewing a row in the spreadsheet.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIs this the default script for the language? Then remove the script element\nfrom the Lang_id. For example, in single script regions, it is very\nunlikely a language will have an orthography in another script.\u003c/li\u003e\n\u003cli\u003eMake sure the appropriate region and script are used in the likely_subtag.\u003c/li\u003e\n\u003cli\u003eCheck the langname and check the script corresponds to the likely_subtag.\u003c/li\u003e\n\u003cli\u003eEnsure the regions list reflects the particular tag rather than the whole\nlanguage. Is the script used in that region. A language script may not be\nused in all regions.\u003c/li\u003e\n\u003cli\u003eThe default region reflects the likely_subtag.\u003c/li\u003e\n\u003cli\u003eIndicate whether the language is unwritten or unused now\u003c/li\u003e\n\u003cli\u003eAreas is helpful for filtering. Iso639 corresponds to the main language\npart of the lang_id\u003c/li\u003e\n\u003cli\u003eAdd your initials to the confirmed, so that you will be included in any\nfuture changes\u003c/li\u003e\n\u003cli\u003eDate the change, please.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExtra Information\u003c/h2\u003e\u003ca id=\"user-content-extra-information\" class=\"anchor\" aria-label=\"Permalink: Extra Information\" href=\"#extra-information\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe SLDR, in addition to keeping the language tags database (eventually), also\nhas other files that help with language tag processing.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003elangtags.txt\u003c/h3\u003e\u003ca id=\"user-content-langtagstxt\" class=\"anchor\" aria-label=\"Permalink: langtags.txt\" href=\"#langtagstxt\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis file consists of a set of language tags equivalence sets, one per line. A\nlanguage tag equivalence set consists of all the tags that are considered\nequivalent. Thus, due to the likely subtags list, en = en-Latn = en-US =\nen-Latn-US. There are a few key characteristics of the way an equivalence set\nis listed. The first element in the list is considered the preferred short tag.\nThe last element in the list is considered the preferred long tag. Everything\nin between is considered simply equivalent. In addition, all tags for which\nthere is a directly referenced file in the SLDR are listed with a * prefix. If\na set has more than one tag marked in this way, then the files are considered\nequivalent by inheritance, differing only in their identity block, and you can\nuse any of them. The earliest starred tag in the list points to the most\ngeneric (and most inherited from) file and the last, the most specific.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples or FAQ\u003c/h2\u003e\u003ca id=\"user-content-examples-or-faq\" class=\"anchor\" aria-label=\"Permalink: Examples or FAQ\" href=\"#examples-or-faq\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTai Dam\u003c/h3\u003e\u003ca id=\"user-content-tai-dam\" class=\"anchor\" aria-label=\"Permalink: Tai Dam\" href=\"#tai-dam\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere's a hypothetical issue. Start with the current state of Tai Dam. The\nlanguage code is blt. It uses three scripts, so that gives us blt-Tavt,\nblt-Laoo, and blt-Latn. It would be reasonable to make blt-Tavt the default, so\nfor it we just use blt. Now for blt-Laoo, we actually have two orthographies,\nthe original dating from 1977, and a revised orthography dating from 2013. We\nhave data in print and electronic form in both versions. I'm not sure how that\nis added to a tag, but it might give you something like blt-Laoo-1977 vs\nblt-Laoo-2013. The 2013 version would be the default, since it's the current\nversion. So that gives us:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"blt = blt-Tavt\nblt-Laoo = blt-Laoo-x-2013\nblt-Laoo-x-1977 = blt-Laoo-x-1977\nblt-Latn = blt-Latn\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eblt = blt-Tavt\nblt-Laoo = blt-Laoo-x-2013\nblt-Laoo-x-1977 = blt-Laoo-x-1977\nblt-Latn = blt-Latn\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSo we adopt those. Then suppose that in 2020 someone comes up with a really\ngreat solution for how to handle the ambiguities that exist in the Lao\northography (I'd really love to see this happen), and we revise it again. Now\nwe have blt-Laoo-x-2020.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDoes the default for blt-Laoo now change to blt-Laoo-x-2020? And if so, what\nhappens to older data that used the blt-Laoo tag?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYes, this is a nasty situation and the current understanding (this answer may\nchange) is that at some point, once blt-Laoo-x-2020 has become established and\npeople want the default orthography to be the new orthography, the default\nmapping gets changed. But how dare they? Doesn't that invalidate all the old\ndata? Actually no. While the likely subtags for a given tag specifies a\nparticular orthography, that is not the same as saying that someone who tags\nusing blt-Laoo is effectively tagging as blt-Laoo-x-2013 (or whatever the\ncurrent mapping is). They are actually tagging saying: this text is in blt-Laoo\nand I am not specifying which particular orthography is in use. That\ninformation is ambiguous at that point. It is only the application of other\nprocesses that try to resolve that ambiguity. That they might resolve it wrong,\nis not really their fault. If you want precise tagging, then use a precise tag\nand always tag with the variant.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis does raise the question that if you tag something blt-Laoo-x-2013, is a\nprocess that rewrites the data, at liberty to simplify the tag back to\nblt-Laoo? The above answer implies that that should not happen. \u003cstrong\u003eApplications\nshould endeavour to rewrite data with the same tag with which it was originally\ntagged.\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRegistry of Dialects\u003c/h3\u003e\u003ca id=\"user-content-registry-of-dialects\" class=\"anchor\" aria-label=\"Permalink: Registry of Dialects\" href=\"#registry-of-dialects\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe Registry of Dialects (ROD), managed by Global Recordings is a valuable\nresource. It provides a central registry of dialects for a language so that\nusers can refer to the same thing. It does much of what language tags aim to do\nin providing a common identifier. But the relationship between a dialect\nidentifier in the ROD is not obvious. Some dialects are regional variants. Some\nare actually the same dialect (due to early registration before the dialect map\nis complete). This is not a problem for what the ROD was developed to do. But\nit does seem to preclude the ROD from being turned into a simple namespace for\ndialect variants. It would probably be unhelpful to allocate a namespace to it,\nas in -r-rod1347. Instead the most helpful approach would be to provide a map\nfrom the ROD to language tags. Since there is no hurry to provide this map, the\nROD provides an excellent first step towards a more stable set of language tags\nfor the dialects of a language.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhen to add a script\u003c/h3\u003e\u003ca id=\"user-content-when-to-add-a-script\" class=\"anchor\" aria-label=\"Permalink: When to add a script\" href=\"#when-to-add-a-script\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA small language, Qabiao [laq] in Vietnam has no record of being written, but\na contact has just informed me of two resources in the language using the\nVietnamese script. When is it appropriate to add a script to a language?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe ideal criteria for adding a script to a language are:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe script is available and the orthography supported by Unicode\u003c/li\u003e\n\u003cli\u003eThe orthography is established and there is a user community using it such\nthat it isn't going to disappear soon and probably not change that much.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe problem is that while the first criterion is easy to meet, the second is\ntrickier to decide when an orthography is mature. Having said that, there is\nnothing to stop us saying that say: laq-Latn is the whole range of\northographies that are currently being used in the Latin script for the\nlanguage. This would apply up until the point that after being established with\nsignificant long lasting literature, the orthography then changes. At this\npoint we would need to add a variant for the old established orthography and a\nvariant for the new orthography. But that is waaay down the road. It may also\nbe that with a dying language, no orthography ever gets established. But then\nit's probably a case of last orthography standing.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOne advantage of a small language group is that it is much easier for an\northography to become established. Mind you it only takes 2 people to have an\nargument! I would be surprised if this language were written in anything other\nthan Latin script, being in Vietnam. So adding a Latn script to the language\nisn't a long stretch. And we can assume it will be the default. But these\nassumptions, are risky. The only reason for proceeding is that we consider the\nrisk to be low due to the language group being in a single script region.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo we could add an entry laq = laq-Latn-VN with a high degree of confidence. If\nthe situation does change, then, again the size of the group and the fluid\nsociolinguistic situation means that there is unlikely to be a lot of wrongly\ntagged data should the mapping change and they suddenly switch to using Khmer\nscript or somesuch.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMacro Languages\u003c/h3\u003e\u003ca id=\"user-content-macro-languages-1\" class=\"anchor\" aria-label=\"Permalink: Macro Languages\" href=\"#macro-languages-1\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eor: Why does the CLDR insist on treating cmn as zh?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eISO 639-3 was developed to address the many languages that are in the world.\nPreviously, there was ISO 639-2 which allowed for new languages only if there\nwas a corpus of 50 publications in the language. In addition, language codes\nwere not allocated very precisely. So there was a language code (qu) for\n'quechua', even though there are some 34 individual languages that call\nthemself a quechua language. In order to not break existing tags, ISO 639-3\ntook in the existing ISO 639-2 codes and created a category: macro language for\nthem. The result has been a cause of confusion ever since.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOne approach to resolving the mess is taken by the CLDR. They establish an\nequivalence between the macro language and one of the languages within the\ncluster. So for qu they chose quz (Cusco Quechua). They then convert any\noccurrence of the lead language into the macro language. Thus quz gets\nconverted to qu. They do this for backward compatibility, rather than the other\nway around. Likewise cmn gets converted to zh. More information on how CLDR\nnormalizes its tags can be found in\n\u003ca href=\"https://unicode.org/reports/tr35/tr35.html#BCP_47_Language_Tag_Conversion\" rel=\"nofollow\"\u003e\u003cem\u003eUTS#35\u003c/em\u003e\u003c/a\u003e\nand\n\u003ca href=\"http://cldr.unicode.org/index/cldr-spec/picking-the-right-language-code\" rel=\"nofollow\"\u003e\u003cem\u003ehere\u003c/em\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe follow CLDR in giving every macro language a default concrete language that is\nmapped to it. Thus, for example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ps = pbu = pbu-AF = pbu-Arab = pbu-Arab-AF = *ps-AF = ps-Arab = ps-Arab-AF\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eps = pbu = pbu-AF = pbu-Arab = pbu-Arab-AF = *ps-AF = ps-Arab = ps-Arab-AF\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewhich says that while Pashto is a macro language, the default language in that set\nis Northern Pashto and that Northern Pashto will be mapped to the macro language\ndue to their equivalence.\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"Language Tagging","kind":"section_1","ident_start":2,"ident_end":18,"extent_start":0,"extent_end":39204,"fully_qualified_name":"Language 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file-name-id-mobile" class="Box-sc-g0xbh4-0 fGqKFv"><div class="Box-sc-g0xbh4-0 eoaCFS js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Language Tagging</h1><a id="user-content-language-tagging" class="anchor" aria-label="Permalink: Language Tagging" href="#language-tagging"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Overview</h2><a id="user-content-overview" class="anchor" aria-label="Permalink: Overview" href="#overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A language tag may be as simple as the three-letter code for the language, or it may additionally include subtags to indicate the script used to write the language (if more than one script is used) or the region of the world (country) where the language is used (if the orthography is different). In the vast majority of cases, the three letter code is sufficient (for example, "aak" for Ankave, a language of Papua New Guinea, rather than "aak-Latn-PG" indicating the Latin script and the country of PNG). Some languages, however, can be written with multiple scripts (for example, "ahk" for Akha, which can be written in Latin, Thai or Myanmar scripts) and need multiple language tags ("ahk" for the Latin case, but also "ahk-Thai" and "ahk-Mymr").</p> <p dir="auto">A "likely subtags" list serves to "fill in the blanks", having entries that supply script and region information for each language tag, for example:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>lang_id</th> <th>likely_subtags</th> </tr> </thead> <tbody> <tr> <td>aak</td> <td>aak-Latn-PG</td> </tr> <tr> <td>ahk</td> <td>ahk-Latn-MM</td> </tr> <tr> <td>ahk-Mymr</td> <td>ahk-Mymr-MM</td> </tr> <tr> <td>ahk-Thai</td> <td>ahk-Thai-TH</td> </tr> <tr> <td>ahk-TH</td> <td>ahk-Latn-TH</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">As a language tag reviewer, you will be looking at language entries in your region in order to:</p> <ul dir="auto"> <li>make the language tag as short as possible without losing information</li> <li>add entries if additional script or region subtags are needed</li> <li>verify that the "likely subtag" contains the correct script and region information for the language tag</li> <li>add your initials in the confirmation column</li> </ul> <p dir="auto">More details about these tasks are explained in the rest of this document. If at the end, you still have questions or things are unclear, please add a comment and the authors will do their best to address it, either directly or by improving the text.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Introduction</h2><a id="user-content-introduction" class="anchor" aria-label="Permalink: Introduction" href="#introduction"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A language tag is a string made up of subtags separated by -. The string can be used as an identifier to tag text in a language, or more precisely, a writing system.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Structure of a Language Tag</h3><a id="user-content-structure-of-a-language-tag" class="anchor" aria-label="Permalink: Structure of a Language Tag" href="#structure-of-a-language-tag"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Here we describe the basic structure of a typical language tag. For the full details and the exceptions see <a href="https://tools.ietf.org/html/bcp47" rel="nofollow"><em>BCP47</em></a>. The structure of a language tag is a sequence of subtags (or components) in order, separated by -. Only the first, language subtag, is required. All other subtags are optional and are only required if they add distinguishing information that is needed to clarify the tag sufficiently to make it useful for what the user is tagging. Yes, this is an ambiguous statement and most of the rest of the document will address that ambiguity. The order and structure of each of the subtags is carefully controlled. Here is a tag showing the various subtags, even if none of them are right, it shows the structure:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="lng-Scrp-RE-variant-n-ext"><pre class="notranslate"><code>lng-Scrp-RE-variant-n-ext </code></pre></div> <p dir="auto">While language tags are interpreted caseless, there is a convention regarding casing. Taking each subtag in turn:</p> <ul dir="auto"> <li> <p dir="auto"><strong>Language</strong>. This is an ISO639 code. If a 2-letter code exists from ISO639-1 or ISO639-2, then use that, else use the 3 letter code from ISO639-3. The subtag is typically lowercase.</p> </li> <li> <p dir="auto"><strong>Script</strong>. This subtag identifies which script is being used. It is a 4 letter code and comes from ISO15924. The subtag is typically title case with the first letter upper case and the rest lowercase.</p> </li> <li> <p dir="auto"><strong>Region</strong>. This subtag is used to indicate a writing system or language variation based on the region. The region code is 2 letters and comes from ISO3166-1 and is typically uppercase.</p> </li> <li> <p dir="auto"><strong>Variant</strong>. Variants are used to distinguish between dialects that share the same language subtag, or orthography variants due to revisions, or anything else. The important thing about the variant (which is 5-11 chars and typically lowercase) is that it has been registered with the language subtag registrar. Private use variants can exist, but they are represented using an extension.</p> </li> <li> <p dir="auto"><strong>Extension</strong>. An extension is prefixed by a single letter namespace code followed by whatever subtags make sense within that namespace. There are a few namespaces of interest:</p> <ul dir="auto"> <li> <p dir="auto">-u- is used by CLDR and ICU to identify processing parameters like which sort order to use or how linebreaking is done. See UTS#35 for details.</p> </li> <li> <p dir="auto">-x- is the private use namespace. Anything after this namespace is treated as private use and has no externally defined meaning. This is useful for doing initial tagging before variants get registered.</p> </li> </ul> </li> </ul> <p dir="auto">There is one other basic language tag structure and that is the private use tag. It simply starts with an x- and all subsequent subtags are private use.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Language Tag Examples</h3><a id="user-content-language-tag-examples" class="anchor" aria-label="Permalink: Language Tag Examples" href="#language-tag-examples"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Here we look at some examples:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ahk"><pre class="notranslate"><code>ahk </code></pre></div> <p dir="auto">This is a typical tag. It simply consists of a single ISO639-3 code. There is no need to provide any distinguishing information because there is no ambiguity. Except in this case there is. So we may want to identify the script being used:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ahk-Latn"><pre class="notranslate"><code>ahk-Latn </code></pre></div> <p dir="auto">This tells us the text is in the Akha language using the Latin script. This is in contrast to the Thai or Burmese script orthographies.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ahk-fonipa"><pre class="notranslate"><code>ahk-fonipa </code></pre></div> <p dir="auto">This tag is common in analysis data. It says that the text is Akha and represented in the IPA. The fonipa variant implicitly implies that the script has to be Latn and so no script subtag is required. Such analysis language tags are not represented in the language tag list because they are not used for orthographies, only for analysis. This does not reduce their validity, just the need for any likely subtags associated with them.</p> <p dir="auto">While the structure of a language tag is clearly defined, which subtags should be present in any given situation is not. There is only one piece of community advice regarding language tagging and that is <em>tag wisely</em>. What does this mean? While there are many cases where things can get complicated, there are a few basic principles:</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">No Redundant Elements</h3><a id="user-content-no-redundant-elements" class="anchor" aria-label="Permalink: No Redundant Elements" href="#no-redundant-elements"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The basic principle is:</p> <p dir="auto">Do not add elements to a tag that do not add distinguishing information</p> <p dir="auto">This is not saying to minimise the tag, since we also need enough information in the tag to distinguish it from other tags of data in a different orthography. But it does mean that for 90% of tags, the tag can consist of just a single ISO 639 initial element.</p> <p dir="auto">But if a tag consists of just the language element, how is an application to know what the script or region is for text tagged with just the language? A default region is important to provide good regional locale information. While a default script may be analysable from the text, it is often preferable to have knowledge of the intended script before processing the text.</p> <p dir="auto">Therefore, it would be helpful if there were some list that specified the default script and region for any given tag. The CLDR is managing one and calls the default information the likely subtags for a given tag. SIL is keeping such a list for the many language tags that it interacts with, <a href="https://github.com/silnrsi/langtags"><em>here</em></a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Managing the Language Tags list</h2><a id="user-content-managing-the-language-tags-list" class="anchor" aria-label="Permalink: Managing the Language Tags list" href="#managing-the-language-tags-list"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The purpose of the SIL Language Tags list is to come up with helpful likely subtags for any given tag and to know who can act as a point of reference regarding a tag in the list. The data originates from the Ethnologue and periodically some resolution will take place, but the list is not master of the Ethnologue, while it does provide some information the Ethnologue may not have.</p> <p dir="auto">Notice that this project does not add language tags for new languages. It entirely bases its information on existing standards, but adds value by bringing those standards together for specific orthographies and writing systems. If there is a need for a new language to be added to the ISO 639 standard then an application needs to be made to the ISO 639-3 registrar. On the other hand if there is a need for a new language tag for a particular orthography variant in a language then application may be made through raising issues on this project repository.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Easy Case</h3><a id="user-content-easy-case" class="anchor" aria-label="Permalink: Easy Case" href="#easy-case"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The easy case is where a language group has no dialects, is found in one primary region and uses only one script and orthography. This is most cases. Consider aak, Ankave, a language of Papua New Guinea. Given its location, it is highly unlikely that the likely subtags for the orthography for this language will be anything other than aak-Latn-PG. And the basic tag need be nothing other than aak. In checking this, someone would ensure that the Lang_id field is simply aak and the likely_subtag is aak-Latn-PG. Once that is done, the person would add their registered initials in the confirmed column. More than one person can confirm the same row and thus if anyone wants to change information on that row, they should build consensus with anyone else in the confirmed cell.</p> <p dir="auto">It may be that the Lang_id field has a script subtag in it which is entirely redundant. This is to be expected. When the data was exported from the Ethnologue, script subtags were left in, even though they could have been reasonably removed. The decision was to act conservatively and encourage confirmers to check their data and remove redundant subtags rather than needing to add them back in.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">What about other scripts?</h4><a id="user-content-what-about-other-scripts" class="anchor" aria-label="Permalink: What about other scripts?" href="#what-about-other-scripts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The aim here is to tag orthographies. Thus while linguists may use other scripts to represent text in the language (for example, Latin romanisations for non-Roman based orthographies), there is not expected to be any community standardisation of these romanisations. Therefore there is no need to add an entry for them. This is particularly true for the -fonipa variant which may be used on any language and implies Latn script. On the other hand, if there is a large community and a standardised romanisation for a writing system, then it may be worth listing the other script, even if it is only used for analysis. For example, polytonic Greek or Hebrew. The issue of languages with multiple established orthographies in multiple scripts is covered later.</p> <p dir="auto">The Zyyy script is inserted into tags for which there is no known script. If you know better, please replace Zyyy with the known script, even if it is Qaax (the script tag for “unwritten”).</p> <p dir="auto">It is possible to tag audio, although we use a private use variant for this: -x-audio. This allows audio text to be treated as just another representation of a language.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Multiple Regions</h4><a id="user-content-multiple-regions" class="anchor" aria-label="Permalink: Multiple Regions" href="#multiple-regions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">What if a language is used in multiple countries? The key question is whether the orthography changes in the other country? If it does, then there should be another full entry for the other orthography. The question then remains as to which country is the default region for the basic tag. For the most part, this is clear. But where it is not, then there may need to be no simple tag and there needs to be one or more tags each with a region subtag.</p> <p dir="auto">What about the list of regions associated with a tag? This list is intended to give the possible range of values that the region subtag for a given tag, can take. A country should only be listed if there is an established community of users of the orthography settled there (or regularly passing through for nomadic groups). This does not include expatriate or diaspora groups. For example, there are speakers of many languages in the world living in London, but that does not mean that there needs to be a -GB type tag for every language.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Unwritten Languages</h4><a id="user-content-unwritten-languages" class="anchor" aria-label="Permalink: Unwritten Languages" href="#unwritten-languages"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It is possible, often, to predict what the language tag will be for an unwritten language. If a confirmer is confident of their prediction, then please feel free to add the tag entry preemptively. But it helps if the fact that the language is currently unwritten can be recorded (in the "unwritten" column). If there is any ambiguity, for example, there is any probability that a language in a Latin script area may end up being written in Arabic script, then do not add a script preemptively. Instead use the Qaax script tag to indicate that the language is as yet unwritten.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Multiple Scripts</h3><a id="user-content-multiple-scripts" class="anchor" aria-label="Permalink: Multiple Scripts" href="#multiple-scripts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The next most complex situation is where a language is written using different scripts. In most cases, there is still a primary default script used for a language and so an entry can be made for the language and the likely_subtag can be set to the default script and region. Then for the other scripts, new rows can be added, one per script.</p> <p dir="auto">In the past, it was felt that region drove script: one used Thai script in Thailand and Khmer script in Cambodia, and therefore the disambiguating information was the region. The problem is that it doesn't tell you what script someone in London will use. For this reason, we record script as taking priority over region. Enough information is recorded that either approach can be taken, so there is no danger.</p> <p dir="auto">For a complex example, consider ahk, Akha. Here is how it is listed in the language tag list:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>lang_id</th> <th>likely_subtags</th> <th>regions</th> </tr> </thead> <tbody> <tr> <td>ahk</td> <td>ahk-Latn-MM</td> <td>CN MM TH</td> </tr> <tr> <td>ahk-Mymr</td> <td>ahk-Mymr-MM</td> <td>MM</td> </tr> <tr> <td>ahk-Thai</td> <td>ahk-Thai-TH</td> <td>TH</td> </tr> <tr> <td>ahk-TH</td> <td>ahk-Latn-TH</td> <td>TH</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">It can be written in Latn, Thai and Mymr scripts. For the most part it is written in Latn script and that is what is the default script for ahk. But there are also entries for the other scripts. The default region is listed for each script along with all the regions in which there is an established user group.</p> <p dir="auto">Whether there should be an extra entry for ahk-TH depends on what the default script is in Thailand. If the default script is Thai, then there is no need for an extra entry since the default region for ahk-Thai is TH and therefore, the default script for ahk-TH is ahk-Thai-TH. But the default script is Latn, and we need an entry to resolve the ambiguity and we add ahk-TH as ahk-Latn-TH. For ahk-MM there are two likely subtags with a region of MM and the default will be taken as the shorter, i.e. ahk-Latn-MM.</p> <p dir="auto">There is one more region of note for ahk and that is CN. CN only occurs in the list of regions for ahk and therefore ahk-CN is equivalent to ahk-Latn-CN. There is no need for an extra entry.</p> <p dir="auto">Deciding what the default script for a language is, is probably more political than linguistic. This isn't a question of whether one script is used by 51% of the population and another by 49%, so picking the winner. The aim is to answer the question: if I just see the language code as the tag, which script should I assume is being used? In some cases (for example where there are 2 large communities using different scripts), it may not be possible to come up with a default. In which case, don't set one. Just list an entry for each of the scripts and not one for the language without a script.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Multiple Orthographies</h3><a id="user-content-multiple-orthographies" class="anchor" aria-label="Permalink: Multiple Orthographies" href="#multiple-orthographies"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In addition to the multi-script situation, there are a number of reasons why a language can end up with multiple orthographies and we discuss some of them here.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Regional Variation</h4><a id="user-content-regional-variation" class="anchor" aria-label="Permalink: Regional Variation" href="#regional-variation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Sometimes a different country uses a different orthography, even though it is the same script as another country. For example, Zaiwa (atb) is written in Latin script. The orthography used in Burma is different to that in China. In this case, we simply acknowledge the fact that atb-MM is different from atb-CN. We would have two entries in the database for the two regions, whether or not one of them is the default.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Competing Variations</h4><a id="user-content-competing-variations" class="anchor" aria-label="Permalink: Competing Variations" href="#competing-variations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In situations where no orthography has become dominant, for a relatively large or disparate language group, different orthographies can emerge and become popular in different regions. Those regions may overlap and not be identifiable using a region tag. In this case, or for whatever reason there are multiple established orthographies for a language, we can use a variant to mark the different orthographies. That still leaves the question of whether one is considered the default, and that can be a highly political question. It may be wisest not to specify a default variant for a language in that case and just to list them all as being equal and required. In politically charged situations like this, the variant tags need to be carefully chosen as needed by the situation. There are no a priori limitations or requirements on private use tags. For standardised tags, there are structural limits as specified in BCP 47.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Time Variation</h4><a id="user-content-time-variation" class="anchor" aria-label="Permalink: Time Variation" href="#time-variation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is probably the most complex tagging issue to address. As an example, consider the case of German. It underwent an orthography change in 1996. So now there is the pre-1996 orthography, or traditional German, and the post 1996 orthography. To indicate these two orthographies, there are two variants: -1901 (for traditional German) and -1996 for modern German. This allows someone to specify precisely which orthography they are talking about, either de-1901 or de-1996. But what about simple de? Users want de to refer to the default standard orthography, which is the modern post 1996 one. At some point, therefore, de needs to switch its default mapping from de-1901 (which didn't actually exist when de was created) to de-1996.</p> <p dir="auto">Moving forward to the present day. If a language is undergoing an orthography change, then you will want the default orthography for the tag to refer to the new standard orthography. The question is whether you want to have a tag for the old orthography. For orthographies in development, the answer is probably no. Just move on and drop the past, either by updating the data to the new orthography or acknowledge that the data is now defunct. In the case where the old orthography was established enough that data in it needs to be kept, then there is a problem. We can create a variant for it, but the old data needs to be retagged at some point if it is not to be confused with the modern orthography. Of course we can also keep it with its old tag and just acknowledge the ambiguity. In such a case, it is probable that a variant will be needed for the new orthography, just so that a very clear contrast can be made. See the Example for Tai Dam later in this document for a worked example.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Stable Tagging</h5><a id="user-content-stable-tagging" class="anchor" aria-label="Permalink: Stable Tagging" href="#stable-tagging"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">For those wanting stable tags, how can they deal with orthography changes? Let's consider the example of de. The year is 1990 and there is only one tag for German: de. All data is tagged de. There are no variants and life is simple. Time passes and it is now 1997. The government has passed the new orthography and as a result two new tags have been created to indicate the two orthographies: de-1901 and de-1996. From now on, the simple de tag is equivalent to de-1996. But all the data we have tagged as de is referring to de-1901. If, in our data repository, we follow a policy of stable language tagging, then whenever there is an orthography variant that can be used, it is used. This means that in 1997 any new data will be tagged de-1996 and never as de. This means that we can interpret de as de-1901 and probably retag it at the first opportunity. But at least we know what things mean. What is needed for this is a mapping from stable ambiguous tags to stable tags. I.e. when we know that the old orthography is de-1901, we record that and now know what de means, because using a stable tagging policy we will never tag data in the new orthography as de.</p> <p dir="auto">A stable tagging policy is very attractive, but doesn't fit with the rest of the industry that says that de means de-1996. Therefore, stable tagging is best used temporarily. While the stable and unstable tags are the same, there is no problem. But when an orthography revision occurs, it is best for data held within a stable tagging environment to be retagged with an unambiguous tag as soon as possible. Then there is no problem and the data can be tagged unstably from then on.</p> <p dir="auto">A classic example of wanting stable tagging is archiving. Here, only stable tags should be used and if an orthography revision occurs, ambiguously tagged data should be retagged and the ambiguous tag never used from then on. Thankfully, retagging can be an automated process. The key is knowing when something was tagged. If we know that something was tagged before the tag was split (or changed), then we know what it means in the new tagging regime for the orthography. One problem an archive can face is that for emerging orthographies, there can be many changes made to an orthography before it stabilises. Again, the date of entry into the archive is key. It is unlikely that anyone will want to come up with variants for all the provisional orthographies. It might be worth introducing a variant that says that a particular data set isn't precisely in the orthography as specified by the non variant tag. But greater precision than that is probably unwarranted. This just goes to show that language tagging isn't perfect.</p> <p dir="auto">The moral of the story: don't change your orthography! Well don't change it once it's become well established. But if you have to, there are ways it can be done, but they are not cost free.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Confirmation</h3><a id="user-content-confirmation" class="anchor" aria-label="Permalink: Confirmation" href="#confirmation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The next most important column is the confirmed field which contains a list of initials of people who have expressed an interest in a row. If you have edited or reviewed a row (would have edited it, but it was correct already) then you should add your initials there. For those in sensitive areas, the initials do not actually have to be yours and you can put someone else's email address in the list of contacts (with their permission) and they can act as the contact for you. Thus many initials can refer to the same email.</p> <p dir="auto">An important set of initials are those of the CLDR. Any row with CLDR in the confirmed field is highlighted in red and italicised to warn people not to just edit it. Any changes to the lang_id and likely_subtag fields must be agreed with the CLDR technical committee first. Notice that other columns, including the regions list, may be edited and your initials added.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Regions</h3><a id="user-content-regions" class="anchor" aria-label="Permalink: Regions" href="#regions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The regions list, as has been mentioned before, contains a list of all the countries in which there is an established user community of the orthography. The list does not need to include expatriate communities, for example in the UK or USA, although if those communities are big or established enough and are recognised as such, by the host country, then it is worth adding them. The regions list is used to resolve the question what script is used for a language-REGION pair. If there is any ambiguity, then it may be necessary to add an explicit language-REGION row to resolve the script question. But where a region is the default region for the correct script of that region, and is not the default region for any other script, then there is no need for an explicit entry.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Dialects</h3><a id="user-content-dialects" class="anchor" aria-label="Permalink: Dialects" href="#dialects"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In many cases whether a language variety is a dialect of another language or a separate language, is clear. In language tagging terms, a dialect is considered a variant of a language and the tag receives a variant to account for that. But variants may be used for other things including different orthographies of a language or dialect. In fact, there is nothing that says a language variant has to be mutually comprehensible with the non-variant language. As such, language tags allow for non mutually intelligible dialects. While this does not make linguistic sense, it can make very good socio-political sense. If a language group considers itself part of another language group, it may be more appropriate to treat as a language variant of the main group rather than give it its own iso639 code, despite what the linguistics might say.</p> <p dir="auto">BCP 47 describes how language variants are tagged. There are a number of ways pertinent to a dialect:</p> <ul dir="auto"> <li>A registered variant subtag (5-11 chars long), registered under the language with the IETF.</li> <li>A regional variant, identified through the regional subtag.</li> <li>A private use variant under the x- namespace.</li> </ul> <p dir="auto">Regional variation is exactly the same issue as for regional orthographic differences. If a dialect is identified with and primarily bound by a country, then the best way to mark the dialect is through the region subtag. For example, Singlish is a dialect of English spoken in Singapore and it might be tagged en-SG. (Although due to its low prestige, people may not want to identify Singlish as the local form of English). There are lexical and grammatical differences. Contrast this with en-CA, Canadian English, whose only difference from British English (or strictly, International English - en-001) is some calendar differences. A language tag is not constrained by the amount of difference between variants. The only thing that is important is whether you can fall back by trimming subtags. Is it acceptable to fall back from en-SG or en-CA? See BCP 47 for more details on this.</p> <p dir="auto">One problem with dialects is akin to that of identifying languages. How does one know how the dialects are to be grouped or separated? Do we mark each village as being its own dialect? This cuts to the heart of what a language tag is. It is a way of identifying two sets of data as being of the same language variety. Therefore a language tag is only of value to a user community. If there is no user community for the tag, then there is little point in having the tag. Further, if a tag is only used by a very small community, who are all in contact with each other, then there is no real need for a standardised tag. It is only as the user community grows that standardisation is needed. So while a tag is only used by a small number of users, it is perfectly adequate to use private use subtags. While data is being analysed, then tagging to the village level is fine. It is only once a dialect needs to be tagged more widely that it needs to be standardised.</p> <p dir="auto">A further problem is that while every effort may be made to keep language tagging from being political, it is often interpreted that way. How dialect groups consider themselves or other groups can get complicated quickly. As stated above, the primary subcategorising of language tags is the ability to fall back to a simpler tag (the tag with the rightmost subtag removed). But there also needs to be a consensus among the users of a language tag of what the tag should be. This agreement includes appropriateness. One of the difficulties is that there needs to be a language variety that is the non-variant language. But it may not be possible to choose one. One approach is to, in effect, invent a dialect that is the most accessible given all the dialects will fall back to it. But this is far from ideal. Another option is to make the unmarked language empty. This makes more sense in theory, but may be pragmatically more frustrating. But at that point, agreed common elements can be transferred from all the dialects into the language.</p> <p dir="auto">But it may be that all this discussion of variants does not help a particular language. It really is a different language and it really needs an ISO-639 code so that it can be tagged. In that case, an important part of developing a tag is deciding on the language part of the tag. Information on how to apply for a iso 639-3 code can be found <a href="http://www-01.sil.org/iso639-3/submit_changes.asp#Submitting" rel="nofollow"><em>here</em></a>. The process can be quite slow and so those thinking whether they need to apply are encouraged to do so earlier rather than later.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Audio/Video</h3><a id="user-content-audiovideo" class="anchor" aria-label="Permalink: Audio/Video" href="#audiovideo"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Language tags were originally envisaged for marking text. The need to mark non-textual media has grown, and thankfully there is a script tag for such data: Zxxx. One convention has grown up for marking audio data using -Zxxx-x-audio. But strictly speaking the -x-audio is unnecessary since for written text, the assumption is that the unwritten form will be audio. The key exception to this is sign languages, where the default clearly needs to be video (-Zxxx-x-video). But a simple tag involving Zxxx is insufficient to tell an application what the tagged data actually is. There is the whole encoding question (including container formats and codecs) which calls for extra information somewhere. While this could be encoded in the language tag, it is more easily handled as extra meta-data. It is unhelpful to encumber a language tag with encoding information since the tag may be used to tag different sets of data, differently encoded and then tag matching will fail.</p> <p dir="auto">On this basis, any information in the -x- such as -x-audio can only be considered advisory and should not be keyed off to define whether an element is audio or video. The data encoding information tells whether it is audio or video. If there is a context where both audio and video data sets are present for the same language, an -x- subtag can be used to add some differentiation, just to make the two tags different in some way.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Timing</h3><a id="user-content-timing" class="anchor" aria-label="Permalink: Timing" href="#timing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The good news in all this complexity is that time is on our side. It is possible to wait and to see how things will work out. Standardisation struggles with change and it can be costly. It is often better to wait until things stabilize so that the resulting tags will last. We do not want to have the meaning of a tag to change, otherwise previously tagged data needs to be retagged.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Macro languages</h3><a id="user-content-macro-languages" class="anchor" aria-label="Permalink: Macro languages" href="#macro-languages"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Some language tags are best not used and alternative used instead. This is indicated by specifying the basic tag to use instead, in the <code>macro</code> field. This replacement may occur for different reasons, but the default is because this language is the default language for a macro language group and the macro language should be used instead.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Deprecation</h3><a id="user-content-deprecation" class="anchor" aria-label="Permalink: Deprecation" href="#deprecation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If a tag has to be withdrawn or changes significantly then the tag is not deleted but it marked as deprecated and the <code>macro</code> field used to indicate which tag is to be used instead. This way a system can now how to handle a withdrawn tag later. In effect a deprecated tag is a special case of a macro language type tag.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Procedure</h3><a id="user-content-procedure" class="anchor" aria-label="Permalink: Procedure" href="#procedure"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Having walked through all the issues involved in tagging, this section gives an overview procedure for reviewing a row in the spreadsheet.</p> <ul dir="auto"> <li>Is this the default script for the language? Then remove the script element from the Lang_id. For example, in single script regions, it is very unlikely a language will have an orthography in another script.</li> <li>Make sure the appropriate region and script are used in the likely_subtag.</li> <li>Check the langname and check the script corresponds to the likely_subtag.</li> <li>Ensure the regions list reflects the particular tag rather than the whole language. Is the script used in that region. A language script may not be used in all regions.</li> <li>The default region reflects the likely_subtag.</li> <li>Indicate whether the language is unwritten or unused now</li> <li>Areas is helpful for filtering. Iso639 corresponds to the main language part of the lang_id</li> <li>Add your initials to the confirmed, so that you will be included in any future changes</li> <li>Date the change, please.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Extra Information</h2><a id="user-content-extra-information" class="anchor" aria-label="Permalink: Extra Information" href="#extra-information"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The SLDR, in addition to keeping the language tags database (eventually), also has other files that help with language tag processing.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">langtags.txt</h3><a id="user-content-langtagstxt" class="anchor" aria-label="Permalink: langtags.txt" href="#langtagstxt"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This file consists of a set of language tags equivalence sets, one per line. A language tag equivalence set consists of all the tags that are considered equivalent. Thus, due to the likely subtags list, en = en-Latn = en-US = en-Latn-US. There are a few key characteristics of the way an equivalence set is listed. The first element in the list is considered the preferred short tag. The last element in the list is considered the preferred long tag. Everything in between is considered simply equivalent. In addition, all tags for which there is a directly referenced file in the SLDR are listed with a * prefix. If a set has more than one tag marked in this way, then the files are considered equivalent by inheritance, differing only in their identity block, and you can use any of them. The earliest starred tag in the list points to the most generic (and most inherited from) file and the last, the most specific.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Examples or FAQ</h2><a id="user-content-examples-or-faq" class="anchor" aria-label="Permalink: Examples or FAQ" href="#examples-or-faq"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Tai Dam</h3><a id="user-content-tai-dam" class="anchor" aria-label="Permalink: Tai Dam" href="#tai-dam"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Here's a hypothetical issue. Start with the current state of Tai Dam. The language code is blt. It uses three scripts, so that gives us blt-Tavt, blt-Laoo, and blt-Latn. It would be reasonable to make blt-Tavt the default, so for it we just use blt. Now for blt-Laoo, we actually have two orthographies, the original dating from 1977, and a revised orthography dating from 2013. We have data in print and electronic form in both versions. I'm not sure how that is added to a tag, but it might give you something like blt-Laoo-1977 vs blt-Laoo-2013. The 2013 version would be the default, since it's the current version. So that gives us:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="blt = blt-Tavt blt-Laoo = blt-Laoo-x-2013 blt-Laoo-x-1977 = blt-Laoo-x-1977 blt-Latn = blt-Latn"><pre class="notranslate"><code>blt = blt-Tavt blt-Laoo = blt-Laoo-x-2013 blt-Laoo-x-1977 = blt-Laoo-x-1977 blt-Latn = blt-Latn </code></pre></div> <p dir="auto">So we adopt those. Then suppose that in 2020 someone comes up with a really great solution for how to handle the ambiguities that exist in the Lao orthography (I'd really love to see this happen), and we revise it again. Now we have blt-Laoo-x-2020.</p> <p dir="auto">Does the default for blt-Laoo now change to blt-Laoo-x-2020? And if so, what happens to older data that used the blt-Laoo tag?</p> <p dir="auto">Yes, this is a nasty situation and the current understanding (this answer may change) is that at some point, once blt-Laoo-x-2020 has become established and people want the default orthography to be the new orthography, the default mapping gets changed. But how dare they? Doesn't that invalidate all the old data? Actually no. While the likely subtags for a given tag specifies a particular orthography, that is not the same as saying that someone who tags using blt-Laoo is effectively tagging as blt-Laoo-x-2013 (or whatever the current mapping is). They are actually tagging saying: this text is in blt-Laoo and I am not specifying which particular orthography is in use. That information is ambiguous at that point. It is only the application of other processes that try to resolve that ambiguity. That they might resolve it wrong, is not really their fault. If you want precise tagging, then use a precise tag and always tag with the variant.</p> <p dir="auto">This does raise the question that if you tag something blt-Laoo-x-2013, is a process that rewrites the data, at liberty to simplify the tag back to blt-Laoo? The above answer implies that that should not happen. <strong>Applications should endeavour to rewrite data with the same tag with which it was originally tagged.</strong></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Registry of Dialects</h3><a id="user-content-registry-of-dialects" class="anchor" aria-label="Permalink: Registry of Dialects" href="#registry-of-dialects"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The Registry of Dialects (ROD), managed by Global Recordings is a valuable resource. It provides a central registry of dialects for a language so that users can refer to the same thing. It does much of what language tags aim to do in providing a common identifier. But the relationship between a dialect identifier in the ROD is not obvious. Some dialects are regional variants. Some are actually the same dialect (due to early registration before the dialect map is complete). This is not a problem for what the ROD was developed to do. But it does seem to preclude the ROD from being turned into a simple namespace for dialect variants. It would probably be unhelpful to allocate a namespace to it, as in -r-rod1347. Instead the most helpful approach would be to provide a map from the ROD to language tags. Since there is no hurry to provide this map, the ROD provides an excellent first step towards a more stable set of language tags for the dialects of a language.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">When to add a script</h3><a id="user-content-when-to-add-a-script" class="anchor" aria-label="Permalink: When to add a script" href="#when-to-add-a-script"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A small language, Qabiao [laq] in Vietnam has no record of being written, but a contact has just informed me of two resources in the language using the Vietnamese script. When is it appropriate to add a script to a language?</p> <p dir="auto">The ideal criteria for adding a script to a language are:</p> <ul dir="auto"> <li>The script is available and the orthography supported by Unicode</li> <li>The orthography is established and there is a user community using it such that it isn't going to disappear soon and probably not change that much.</li> </ul> <p dir="auto">The problem is that while the first criterion is easy to meet, the second is trickier to decide when an orthography is mature. Having said that, there is nothing to stop us saying that say: laq-Latn is the whole range of orthographies that are currently being used in the Latin script for the language. This would apply up until the point that after being established with significant long lasting literature, the orthography then changes. At this point we would need to add a variant for the old established orthography and a variant for the new orthography. But that is waaay down the road. It may also be that with a dying language, no orthography ever gets established. But then it's probably a case of last orthography standing.</p> <p dir="auto">One advantage of a small language group is that it is much easier for an orthography to become established. Mind you it only takes 2 people to have an argument! I would be surprised if this language were written in anything other than Latin script, being in Vietnam. So adding a Latn script to the language isn't a long stretch. And we can assume it will be the default. But these assumptions, are risky. The only reason for proceeding is that we consider the risk to be low due to the language group being in a single script region.</p> <p dir="auto">So we could add an entry laq = laq-Latn-VN with a high degree of confidence. If the situation does change, then, again the size of the group and the fluid sociolinguistic situation means that there is unlikely to be a lot of wrongly tagged data should the mapping change and they suddenly switch to using Khmer script or somesuch.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Macro Languages</h3><a id="user-content-macro-languages-1" class="anchor" aria-label="Permalink: Macro Languages" href="#macro-languages-1"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">or: Why does the CLDR insist on treating cmn as zh?</p> <p dir="auto">ISO 639-3 was developed to address the many languages that are in the world. Previously, there was ISO 639-2 which allowed for new languages only if there was a corpus of 50 publications in the language. In addition, language codes were not allocated very precisely. So there was a language code (qu) for 'quechua', even though there are some 34 individual languages that call themself a quechua language. In order to not break existing tags, ISO 639-3 took in the existing ISO 639-2 codes and created a category: macro language for them. The result has been a cause of confusion ever since.</p> <p dir="auto">One approach to resolving the mess is taken by the CLDR. They establish an equivalence between the macro language and one of the languages within the cluster. So for qu they chose quz (Cusco Quechua). They then convert any occurrence of the lead language into the macro language. Thus quz gets converted to qu. They do this for backward compatibility, rather than the other way around. Likewise cmn gets converted to zh. More information on how CLDR normalizes its tags can be found in <a href="https://unicode.org/reports/tr35/tr35.html#BCP_47_Language_Tag_Conversion" rel="nofollow"><em>UTS#35</em></a> and <a href="http://cldr.unicode.org/index/cldr-spec/picking-the-right-language-code" rel="nofollow"><em>here</em></a>.</p> <p dir="auto">We follow CLDR in giving every macro language a default concrete language that is mapped to it. Thus, for example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ps = pbu = pbu-AF = pbu-Arab = pbu-Arab-AF = *ps-AF = ps-Arab = ps-Arab-AF"><pre class="notranslate"><code>ps = pbu = pbu-AF = pbu-Arab = pbu-Arab-AF = *ps-AF = ps-Arab = ps-Arab-AF </code></pre></div> <p dir="auto">which says that while Pashto is a macro language, the default language in that set is Northern Pashto and that Northern Pashto will be mapped to the macro language due to their equivalence.</p> </article></div><button hidden=""></button></section></div></div></div> <!-- --> <!-- --> </div></div></div><div class="Box-sc-g0xbh4-0"></div></div></div></div></div><div id="find-result-marks-container" class="Box-sc-g0xbh4-0 cCoXib"></div><button hidden="" data-testid="" data-hotkey-scope="read-only-cursor-text-area"></button><button hidden=""></button></div> <!-- --> <!-- --> <script type="application/json" 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data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> You can’t perform that action at this time. </div> <template id="site-details-dialog"> <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open> <summary role="button" aria-label="Close dialog"></summary> <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal"> <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div class="octocat-spinner my-6 js-details-dialog-spinner"></div> </details-dialog> </details> </template> <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;"> <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>