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GitHub - cabo/kramdown-rfc: An XML2RFC (RFC799x) backend for Thomas Leitner's kramdown markdown parser
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class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 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 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow color-fg-subtle mr-3"> <path d="M1 3a2 2 0 0 1 2-2h6.5a2 2 0 0 1 2 2v6.5a2 2 0 0 1-2 2H7v4.063C7 16.355 7.644 17 8.438 17H12.5v-2.5a2 2 0 0 1 2-2H21a2 2 0 0 1 2 2V21a2 2 0 0 1-2 2h-6.5a2 2 0 0 1-2-2v-2.5H8.437A2.939 2.939 0 0 1 5.5 15.562V11.5H3a2 2 0 0 1-2-2Zm2-.5a.5.5 0 0 0-.5.5v6.5a.5.5 0 0 0 .5.5h6.5a.5.5 0 0 0 .5-.5V3a.5.5 0 0 0-.5-.5ZM14.5 14a.5.5 0 0 0-.5.5V21a.5.5 0 0 0 .5.5H21a.5.5 0 0 0 .5-.5v-6.5a.5.5 0 0 0-.5-.5Z"></path> </svg> <div> <div class="color-fg-default h4">Actions</div> Automate any workflow </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"codespaces","context":"product","tag":"link","label":"codespaces_link_product_navbar"}" href="https://github.com/features/codespaces"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-codespaces color-fg-subtle mr-3"> <path d="M3.5 3.75C3.5 2.784 4.284 2 5.25 2h13.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 18.75 13H5.25a1.75 1.75 0 0 1-1.75-1.75Zm-2 12c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v4a1.75 1.75 0 0 1-1.75 1.75H3.25a1.75 1.75 0 0 1-1.75-1.75ZM5.25 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h13.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Zm-2 12a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h17.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25Z"></path><path d="M10 17.75a.75.75 0 0 1 .75-.75h6.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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href="https://github.com/features/code-review"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-review color-fg-subtle mr-3"> <path d="M10.3 6.74a.75.75 0 0 1-.04 1.06l-2.908 2.7 2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M1.5 4.25c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v12.5a1.75 1.75 0 0 1-1.75 1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"discussions","context":"product","tag":"link","label":"discussions_link_product_navbar"}" href="https://github.com/features/discussions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-comment-discussion color-fg-subtle mr-3"> <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 14.25 14H8.061l-2.574 2.573A1.458 1.458 0 0 1 3 15.543V14H1.75A1.75 1.75 0 0 1 0 12.25v-9.5C0 1.784.784 1 1.75 1ZM1.5 2.75v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Z"></path><path d="M22.5 8.75a.25.25 0 0 0-.25-.25h-3.5a.75.75 0 0 1 0-1.5h3.5c.966 0 1.75.784 1.75 1.75v9.5A1.75 1.75 0 0 1 22.25 20H21v1.543a1.457 1.457 0 0 1-2.487 1.03L15.939 20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"code_search","context":"product","tag":"link","label":"code_search_link_product_navbar"}" href="https://github.com/features/code-search"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-square color-fg-subtle mr-3"> <path d="M10.3 8.24a.75.75 0 0 1-.04 1.06L7.352 12l2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M2 3.75C2 2.784 2.784 2 3.75 2h16.5c.966 0 1.75.784 1.75 1.75v16.5A1.75 1.75 0 0 1 20.25 22H3.75A1.75 1.75 0 0 1 2 20.25Zm1.75-.25a.25.25 0 0 0-.25.25v16.5c0 .138.112.25.25.25h16.5a.25.25 0 0 0 .25-.25V3.75a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Search</div> Find more, search less </div> </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="product-explore-heading">Explore</span> <ul class="list-style-none f5" aria-labelledby="product-explore-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"all_features","context":"product","tag":"link","label":"all_features_link_product_navbar"}" href="https://github.com/features"> 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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> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="KocV5ChMm1XnAosflaIHpH3nrN5xLMfK5kxTs8JRT6bmF5R2bRs73j1ECpMvKx7IWhV+B86u+N9u6G+00VcY8w==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" 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dir=\"auto\"\u003ekramdown-rfc\u003c/h1\u003e\u003ca id=\"user-content-kramdown-rfc\" class=\"anchor\" aria-label=\"Permalink: kramdown-rfc\" href=\"#kramdown-rfc\"\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\"\u003e\u003ca href=\"https://kramdown.gettalong.org\" rel=\"nofollow\"\u003ekramdown\u003c/a\u003e is a \u003ca href=\"http://en.wikipedia.org/wiki/Markdown\" rel=\"nofollow\"\u003emarkdown\u003c/a\u003e parser by Thomas Leitner, which has a\nnumber of backends for generating HTML, Latex, and markdown again.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003ekramdown-rfc\u003c/strong\u003e is an additional backend to that: It allows the\ngeneration of \u003ca href=\"https://github.com/ietf-tools/xml2rfc\"\u003eXML2RFC\u003c/a\u003e XML markup (originally known as \u003ca href=\"https://www.rfc-editor.org/rfc/rfc2629.html\" rel=\"nofollow\"\u003eRFC 2629\u003c/a\u003e\ncompliant markup, with a newer version documented in \u003ca href=\"https://www.rfc-editor.org/rfc/rfc7749.html\" rel=\"nofollow\"\u003eRFC 7749\u003c/a\u003e;\nversion 3 now documented in \u003ca href=\"https://www.rfc-editor.org/rfc/rfc7991.html\" rel=\"nofollow\"\u003eRFC 7991\u003c/a\u003e etc. and \u003ca href=\"https://authors.ietf.org/rfcxml-vocabulary\" rel=\"nofollow\"\u003ev3\u003c/a\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWho would care? Anybody who is writing Internet-Drafts and RFCs in\nthe \u003ca href=\"http://www.ietf.org\" rel=\"nofollow\"\u003eIETF\u003c/a\u003e and prefers (or has co-authors who prefer) to do part of\ntheir work in markdown.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ekramdown-rfc is documented on this page, and also on\n\u003ca href=\"https://github.com/cabo/kramdown-rfc/wiki\"\u003ethe wiki\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage\u003c/h1\u003e\u003ca id=\"user-content-usage\" class=\"anchor\" aria-label=\"Permalink: Usage\" href=\"#usage\"\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\"\u003eStart by installing the kramdown-rfc gem (this automatically\ninstalls appropriate versions of referenced gems such as kramdown as\nwell):\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"gem install kramdown-rfc\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003egem install kramdown-rfc\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(Add a \u003ccode\u003esudo\u003c/code\u003e and a space in front of that command if you don't have\nall the permissions needed.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe guts of kramdown-rfc are in one Ruby file,\n\u003ccode\u003elib/kramdown-rfc2629.rb\u003c/code\u003e --- this melds nicely into the extension\nstructure provided by kramdown. \u003ccode\u003ebin/kramdown-rfc\u003c/code\u003e started out as\na simple command-line program showing how to use this, but can now do\nmuch more (see below).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo use kramdown-rfc, you'll need Ruby (at least version 2.3, but\npreferably a current version), and maybe\n\u003ca href=\"https://github.com/ietf-tools/xml2rfc\"\u003eXML2RFC\u003c/a\u003e if you want to see the fruits of your work.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"kramdown-rfc mydraft.md \u0026gt;mydraft.xml\nxml2rfc mydraft.xml\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ekramdown-rfc mydraft.md \u0026gt;mydraft.xml\nxml2rfc mydraft.xml\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(The most popular file name extension that IETF people have for\nmarkdown is .md -- for those who tend to think about GNU machine\ndescriptions here, any extension such as .mkd will do, too.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA more brief interface for both calling kramdown-rfc and XML2RFC\nis provided by \u003ccode\u003ekdrfc\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"kdrfc mydraft.md\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ekdrfc mydraft.md\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ekdrfc\u003c/code\u003e can also use a remote installation of XML2RFC if needed:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"kdrfc -r mydraft.md\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ekdrfc -r mydraft.md\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVersions of RFCXML\u003c/h1\u003e\u003ca id=\"user-content-versions-of-rfcxml\" class=\"anchor\" aria-label=\"Permalink: Versions of RFCXML\" href=\"#versions-of-rfcxml\"\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\"\u003eSince RFC 8650, RFCs are using an updated grammar as defined in RFC\n7991 to 7998 and further updated informally since, colloquially called \"\u003ca href=\"https://authors.ietf.org/rfcxml-vocabulary\" rel=\"nofollow\"\u003ev3\u003c/a\u003e\".\nAs RFC 2629 is no longer the governing standard, what was called kramdown-rfc2629 is\nnow called kramdown-rfc. The latter command defaults to v3 processing\nrules; from 2022-02-22T22:02:22 on, the old kramdown-rfc2629 driver program does as well (1.6.1).\n(-3/--v3 and -2/--v2 select v3 and v2 explicitly; the latter should\nonly be needed if there is a reason to to make a document look\nlike it's 2016.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee also \u003ca href=\"https://mailarchive.ietf.org/arch/msg/rfc-markdown/JC__LDDGuUbSFqyaEntF9r4kwKw\" rel=\"nofollow\"\u003ev3 announcement mail\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h1\u003e\u003ca id=\"user-content-examples\" class=\"anchor\" aria-label=\"Permalink: Examples\" href=\"#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\"\u003eFor historical interest\n\u003ccode\u003estupid.mkd\u003c/code\u003e was an early markdown version of an actual Internet-Draft\n(for a protocol called \u003ca href=\"http://tools.ietf.org/id/draft-hartke-xmpp-stupid-00\" rel=\"nofollow\"\u003eSTuPiD\u003c/a\u003e [sic!]). This demonstrated some,\nbut not all features of kramdown-rfc. Since markdown/kramdown\ndoes not cater for all the structure of an RFC 7991 style document,\nsome of the markup is in XML, and the example switches between XML and\nmarkdown using kramdown's \u003ccode\u003e{::nomarkdown}\u003c/code\u003e and \u003ccode\u003e{:/nomarkdown}\u003c/code\u003e (this\nis ugly, but works well enough). \u003ccode\u003estupid.xml\u003c/code\u003e and \u003ccode\u003estupid.txt\u003c/code\u003e show\nwhat kramdown-rfc and xml2rfc make out of this.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003estupid-s.mkd\u003c/code\u003e is the same document in the new sectionized format\nsupported by kramdown-rfc. The document metadata are in a short\npiece of YAML at the start, and from there, \u003ccode\u003eabstract\u003c/code\u003e, \u003ccode\u003emiddle\u003c/code\u003e,\nreferences (\u003ccode\u003enormative\u003c/code\u003e and \u003ccode\u003einformative\u003c/code\u003e) and \u003ccode\u003eback\u003c/code\u003e are sections\ndelimited in the markdown file. See the example for how this works.\nThe sections \u003ccode\u003enormative\u003c/code\u003e and \u003ccode\u003einformative\u003c/code\u003e can be populated right from\nthe metadata, so there is never a need to write XML any more.\nMuch less scary, and no \u003ccode\u003e{:/nomarkdown}\u003c/code\u003e etc. is needed any more.\nSimilarly, \u003ccode\u003estupid-s.xml\u003c/code\u003e and \u003ccode\u003estupid-s.txt\u003c/code\u003e show what\nkramdown-rfc and xml2rfc make out of this.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003edraft-ietf-core-block-xx.mkd\u003c/code\u003e is a real-world example of a current\nInternet-Draft done this way. For RFC and Internet-Draft references,\nit uses document prolog entities instead of caching the references in\nthe XML (i.e., not standalone mode, this is easier to handle when\ncollaborating with XML-only co-authors). See the \u003ccode\u003ebibxml\u003c/code\u003e metadata.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eThe YAML header\u003c/h1\u003e\u003ca id=\"user-content-the-yaml-header\" class=\"anchor\" aria-label=\"Permalink: The YAML header\" href=\"#the-yaml-header\"\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\"\u003ePlease consult the examples for the structure of the YAML header, this should be mostly\nobvious. The \u003ccode\u003estand_alone\u003c/code\u003e attribute controls whether the RFC/I-D\nreferences are inserted into the document (yes) or entity-referenced\n(no), the latter leads to increased build time, but may be more\npalatable for a final XML conversion.\nThe author entry can be a single hash or a list, as in:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"author:\n ins: C. Bormann\n name: Carsten Bormann\n org: Universität Bremen TZI\n abbrev: TZI\n street: Bibliothekstr. 1\n city: Bremen\n code: D-28359\n country: Germany\n phone: +49-421-218-63921\n email: cabo@tzi.org\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eauthor:\n ins: C. Bormann\n name: Carsten Bormann\n org: Universität Bremen TZI\n abbrev: TZI\n street: Bibliothekstr. 1\n city: Bremen\n code: D-28359\n country: Germany\n phone: +49-421-218-63921\n email: cabo@tzi.org\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eor\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"author:\n -\n ins: C. Bormann\n name: Carsten Bormann\n org: Universität Bremen TZI\n email: cabo@tzi.org\n -\n ins: Z. Shelby\n name: Zach Shelby\n org: Sensinode\n role: editor\n street: Kidekuja 2\n city: Vuokatti\n code: 88600\n country: Finland\n phone: \u0026quot;+358407796297\u0026quot;\n email: zach@sensinode.com\n -\n role: editor\n ins: P. Thubert\n name: Pascal Thubert\n org: Cisco Systems\n abbrev: Cisco\n street:\n - Village d'Entreprises Green Side\n - 400, Avenue de Roumanille\n - Batiment T3\n city: Biot - Sophia Antipolis\n code: '06410'\n country: FRANCE\n phone: \u0026quot;+33 4 97 23 26 34\u0026quot;\n email: pthubert@cisco.com\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eauthor:\n -\n ins: C. Bormann\n name: Carsten Bormann\n org: Universität Bremen TZI\n email: cabo@tzi.org\n -\n ins: Z. Shelby\n name: Zach Shelby\n org: Sensinode\n role: editor\n street: Kidekuja 2\n city: Vuokatti\n code: 88600\n country: Finland\n phone: \"+358407796297\"\n email: zach@sensinode.com\n -\n role: editor\n ins: P. Thubert\n name: Pascal Thubert\n org: Cisco Systems\n abbrev: Cisco\n street:\n - Village d'Entreprises Green Side\n - 400, Avenue de Roumanille\n - Batiment T3\n city: Biot - Sophia Antipolis\n code: '06410'\n country: FRANCE\n phone: \"+33 4 97 23 26 34\"\n email: pthubert@cisco.com\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(the hash keys are the XML GIs from RFC 7749, with a flattened\nstructure. As RFC 7749 requires giving both the full name and\nsurname/initials, we use \u003ccode\u003eins\u003c/code\u003e as an abbreviation for\n\"initials/surname\". Yes, the toolchain is Unicode-capable, even if\nthe final RFC output is still in ASCII.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that the YAML header needs to be syntactically valid YAML.\nWhere there is a potential for triggering some further YAML feature, a\nstring should be put in quotes (like the \"+358407796297\" above, which\nmight otherwise be interpreted as a number, losing the + sign).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReferences\u003c/h2\u003e\u003ca id=\"user-content-references\" class=\"anchor\" aria-label=\"Permalink: References\" href=\"#references\"\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 references section is built from the references listed in the YAML\nheader and from references made inline to RFCs and I-Ds in the\nmarkdown text. Since kramdown-rfc cannot know whether a reference\nis normative or informative, no entry is generated by default in the\nreferences section. By indicating a normative reference as in\n\u003ccode\u003e{{!RFC2119}}\u003c/code\u003e or an informative one as in \u003ccode\u003e{{?RFC1925}}\u003c/code\u003e, you can\ncompletely automate the referencing, without the need to write\nanything in the header. Alternatively, you can write something like:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"informative:\n RFC1925:\nnormative:\n RFC2119:\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003einformative:\n RFC1925:\nnormative:\n RFC2119:\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eand then just write \u003ccode\u003e{{RFC2119}}\u003c/code\u003e or \u003ccode\u003e{{RFC1925}}\u003c/code\u003e. (Yes, there is a\ncolon in the YAML, because this is a hash that could provide other\ninformation.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSince version 1.1, references imported from the \u003ca href=\"https://bib.ietf.org/\" rel=\"nofollow\"\u003eBibXML\u003c/a\u003e databases\ncan be supplied with a replacement label (anchor name). E.g., RFC 793\ncould be referenced as \u003ccode\u003e{{!TCP=RFC0793}}\u003c/code\u003e, further references then just\ncan say \u003ccode\u003e{{TCP}}\u003c/code\u003e; both will get \u003ccode\u003e[TCP]\u003c/code\u003e as the label. In the\nYAML, the same replacement can be expressed as in the first example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" normative:\n TCP: RFC0793\n informative:\n SST: DOI.10.1145/1282427.1282421\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e normative:\n TCP: RFC0793\n informative:\n SST: DOI.10.1145/1282427.1282421\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotes about this feature:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThank you, Martin Thomson, for supplying an implementation and\ninsisting this be done.\u003c/li\u003e\n\u003cli\u003eWhile this feature is now available, you are not forced to use it\nfor everything: readers of documents often benefit from not having\nto look up references, so continuing to use the draft names and RFC\nnumbers as labels may be the preferable style in many cases.\u003c/li\u003e\n\u003cli\u003eAs a final caveat, renaming anchors does not work in the\n\u003ccode\u003estand_alone: no\u003c/code\u003e mode (except for IANA and DOI), as there is no\nsuch mechanism in XML entity referencing; exporting to XML while\nmaintaining live references then may require some manual editing to\nget rid of the custom anchors.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIf your references are not in the \u003ca href=\"https://bib.ietf.org/\" rel=\"nofollow\"\u003eBibXML\u003c/a\u003e databases and do not\nhave a DOI (that also happens to have correct data) either, you need\nto spell it out like in the examples below:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"informative:\n RFC1925:\n WEI:\n title: \u0026quot;6LoWPAN: the Wireless Embedded Internet\u0026quot;\n # see the quotes above? Needed because of the embedded colon.\n author:\n -\n ins: Z. Shelby\n name: Zach Shelby\n -\n ins: C. Bormann\n name: Carsten Bormann\n date: 2009\n seriesinfo:\n ISBN: 9780470747995\n ann: This is a really good reference on 6LoWPAN.\n ASN.1:\n title: \u0026gt;\n Information Technology — ASN.1 encoding rules:\n Specification of Basic Encoding Rules (BER), Canonical Encoding\n Rules (CER) and Distinguished Encoding Rules (DER)\n # YAML's \u0026quot;\u0026gt;\u0026quot; syntax used above is a good way to write longer titles\n author:\n org: International Telecommunications Union\n date: 1994\n seriesinfo:\n ITU-T: Recommendation X.690\n REST:\n target: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf\n title: Architectural Styles and the Design of Network-based Software Architectures\n author:\n ins: R. Fielding\n name: Roy Thomas Fielding\n org: University of California, Irvine\n date: 2000\n seriesinfo:\n \u0026quot;Ph.D.\u0026quot;: \u0026quot;Dissertation, University of California, Irvine\u0026quot;\n format:\n PDF: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf\n COAP:\n title: \u0026quot;CoAP: An Application Protocol for Billions of Tiny Internet Nodes\u0026quot;\n seriesinfo:\n DOI: 10.1109/MIC.2012.29\n date: 2012\n author:\n -\n ins: C. Bormann\n name: Carsten Bormann\n -\n ins: A. P. Castellani\n name: Angelo P. Castellani\n -\n ins: Z. Shelby\n name: Zach Shelby\n IPSO:\n title: IP for Smart Objects (IPSO)\n author:\n - org:\n date: false\n seriesinfo:\n Web: http://ipso-alliance.github.io/pub/\nnormative:\n ECMA262:\n author:\n org: European Computer Manufacturers Association\n title: ECMAScript Language Specification 5.1 Edition\n date: 2011-06\n target: http://www.ecma-international.org/publications/files/ecma-st/ECMA-262.pdf\n seriesinfo:\n ECMA: Standard ECMA-262\n RFC2119:\n RFC6690:\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003einformative:\n RFC1925:\n WEI:\n title: \"6LoWPAN: the Wireless Embedded Internet\"\n # see the quotes above? Needed because of the embedded colon.\n author:\n -\n ins: Z. Shelby\n name: Zach Shelby\n -\n ins: C. Bormann\n name: Carsten Bormann\n date: 2009\n seriesinfo:\n ISBN: 9780470747995\n ann: This is a really good reference on 6LoWPAN.\n ASN.1:\n title: \u0026gt;\n Information Technology — ASN.1 encoding rules:\n Specification of Basic Encoding Rules (BER), Canonical Encoding\n Rules (CER) and Distinguished Encoding Rules (DER)\n # YAML's \"\u0026gt;\" syntax used above is a good way to write longer titles\n author:\n org: International Telecommunications Union\n date: 1994\n seriesinfo:\n ITU-T: Recommendation X.690\n REST:\n target: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf\n title: Architectural Styles and the Design of Network-based Software Architectures\n author:\n ins: R. Fielding\n name: Roy Thomas Fielding\n org: University of California, Irvine\n date: 2000\n seriesinfo:\n \"Ph.D.\": \"Dissertation, University of California, Irvine\"\n format:\n PDF: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf\n COAP:\n title: \"CoAP: An Application Protocol for Billions of Tiny Internet Nodes\"\n seriesinfo:\n DOI: 10.1109/MIC.2012.29\n date: 2012\n author:\n -\n ins: C. Bormann\n name: Carsten Bormann\n -\n ins: A. P. Castellani\n name: Angelo P. Castellani\n -\n ins: Z. Shelby\n name: Zach Shelby\n IPSO:\n title: IP for Smart Objects (IPSO)\n author:\n - org:\n date: false\n seriesinfo:\n Web: http://ipso-alliance.github.io/pub/\nnormative:\n ECMA262:\n author:\n org: European Computer Manufacturers Association\n title: ECMAScript Language Specification 5.1 Edition\n date: 2011-06\n target: http://www.ecma-international.org/publications/files/ecma-st/ECMA-262.pdf\n seriesinfo:\n ECMA: Standard ECMA-262\n RFC2119:\n RFC6690:\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(as in the author list, \u003ccode\u003eins\u003c/code\u003e is an abbreviation for\n\"initials/surname\"; note that the first title had to be put in double\nquotes as it contains a colon which is special syntax in YAML.)\nThen you can simply reference \u003ccode\u003e{{ASN.1}}\u003c/code\u003e and\n\u003ccode\u003e{{ECMA262}}\u003c/code\u003e in the text. (Make sure the reference keys are valid XML\nnames, though.)\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExperimental features\u003c/h1\u003e\u003ca id=\"user-content-experimental-features\" class=\"anchor\" aria-label=\"Permalink: Experimental features\" href=\"#experimental-features\"\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\"\u003eMost of the \u003ca href=\"http://kramdown.gettalong.org/syntax.html\" rel=\"nofollow\"\u003ekramdown syntax\u003c/a\u003e is supported and does\nsomething useful; with the exception of the math syntax (math has no\nspecial support in XML2RFC), and HTML syntax of course.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA number of more esoteric features have recently been added.\n(The minimum required version for each full feature is indicated.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.3.x)\nSlowly improving support for SVG generating tools for XML2RFCv3 (i.e.,\nwith \u003ccode\u003e-3\u003c/code\u003e flag).\nThese tools must be installed and callable from the command line.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe basic idea is to mark an input code block with one of the following\nlabels (language types), yielding some plaintext form in the .TXT\noutput and a graphical form in the .HTML output. The plaintext is the\ninput in some cases (e.g., ASCII art, \u003ccode\u003emscgen\u003c/code\u003e), or some plaintext\noutput generated by the tool (e.g., \u003ccode\u003eplantuml-utxt\u003c/code\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCurrently supported labels as of 1.3.9:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/blampe/goat\"\u003egoat\u003c/a\u003e, \u003ca href=\"https://github.com/stathissideris/ditaa\"\u003editaa\u003c/a\u003e: ASCII (plaintext) art to figure conversion\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"http://www.mcternan.me.uk/mscgen/\" rel=\"nofollow\"\u003emscgen\u003c/a\u003e: Message Sequence Charts\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://plantuml.com\" rel=\"nofollow\"\u003eplantuml\u003c/a\u003e: widely used multi-purpose diagram generator\u003c/li\u003e\n\u003cli\u003eplantuml-utxt: Like plantuml, except that a plantuml-generated\nplaintext form is used\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/mermaid-js/mermaid-cli\"\u003emermaid\u003c/a\u003e: Very experimental; the conversion to SVG is prone to\ngenerate black-on-black text in this version\u003c/li\u003e\n\u003cli\u003emath: display math using \u003ca href=\"https://github.com/mathjax/MathJax-demos-node/blob/master/direct/tex2svg\"\u003etex2svg\u003c/a\u003e for HTML/PDF and \u003ca href=\"https://github.com/bartp5/libtexprintf\"\u003eutftex\u003c/a\u003e\nfor plaintext\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eNote that this feature does not play well with the CI (continuous\nintegration) support in Martin Thomson's \u003ca href=\"https://github.com/martinthomson/i-d-template\"\u003eI-D Template\u003c/a\u003e, as that may\nnot have the tools installed in its docker instance.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMore details have been collected on the \u003ca href=\"https://github.com/cabo/kramdown-rfc/wiki/SVG\"\u003ewiki\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.2.9:)\nThe YAML header now allows specifying \u003ca href=\"https://kramdown.gettalong.org/options.html\" rel=\"nofollow\"\u003ekramdown_options\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis was added specifically to provide easier access to the kramdown\n\u003ccode\u003eauto_id_prefix\u003c/code\u003e feature, which prefixes by some distinguishing string\nthe anchors that are auto-generated for sections, avoiding conflicts:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-yaml notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"kramdown_options:\n auto_id_prefix: sec-\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003ekramdown_options\u003c/span\u003e:\n \u003cspan class=\"pl-ent\"\u003eauto_id_prefix\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003esec-\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(1.2.8:)\nAn experimental feature was added to include \u003ca href=\"https://www.rfc-editor.org/info/bcp14\" rel=\"nofollow\"\u003eBCP 14\u003c/a\u003e boilerplate:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{::boilerplate bcp14}\"\u003e\u003cpre\u003e{::boilerplate bcp14}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewhich saves some typing. Saying \"bcp14+\" instead of \"bcp14\" adds some\nrandom clarifications at the end of the \u003ca href=\"https://tools.ietf.org/html/rfc8174#page-3\" rel=\"nofollow\"\u003estandard boilerplate text\u003c/a\u003e that\nyou may or may not want to have. (Do we need other boilerplate items\nbeyond BCP14?)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.35:)\nAn experimental command \u003ccode\u003edoilit\u003c/code\u003e has been added. It can be used to\nconvert DOIs given on the command line into references entries for\nkramdown-rfc YAML, saving a lot of typing. Note that the DOI database\nis not of very consistent quality, so you likely have to hand-edit the\nresult before including it into the document (use \u003ccode\u003e-v\u003c/code\u003e to see raw JSON\ndata from the DOI database, made somewhat readable by converting it\ninto YAML). Use \u003ccode\u003e-c\u003c/code\u003e to enable caching (requires \u003ccode\u003eopen-uri-cached\u003c/code\u003e\ngem). Use \u003ccode\u003e-h=handle\u003c/code\u003e in front of a DOI to set a handle different\nfrom the default \u003ccode\u003ea\u003c/code\u003e, \u003ccode\u003eb\u003c/code\u003e, etc. Similarly, use \u003ccode\u003e-x=handle\u003c/code\u003e to\ngenerate XML2RFCv2 XML instead of kramdown-rfc YAML.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.31:)\nThe kramdown \u003ccode\u003esmart_quotes\u003c/code\u003e feature can be controlled better.\nBy default, it is on (with default kramdown settings), unless \u003ccode\u003ecoding: us-ascii\u003c/code\u003e is in effect (1.3.14: or --v3 is given), in which case it is off by default.\nIt also can be explicitly set on (\u003ccode\u003etrue\u003c/code\u003e) or off (\u003ccode\u003efalse\u003c/code\u003e) in the YAML\nheader, or to a specific value (an array of four kramdown entity names\nor character numbers). E.g., for a German text (that is not intended\nto become an Internet-Draft), one might write:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-yaml notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"smart_quotes: [sbquo, lsquo, bdquo, ldquo]\npi:\n topblock: no\n private: yes\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ent\"\u003esmart_quotes\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e[sbquo, lsquo, bdquo, ldquo]\u003c/span\u003e\n\u003cspan class=\"pl-ent\"\u003epi\u003c/span\u003e:\n \u003cspan class=\"pl-ent\"\u003etopblock\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003eno\u003c/span\u003e\n \u003cspan class=\"pl-ent\"\u003eprivate\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003eyes\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(1.0.30:)\nkramdown-rfc now uses kramdown 1.10, which leads to two notable updates:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSupport for empty link texts in the standard markdown\nreference syntax, as in \u003ccode\u003e[](#RFC7744)\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eLanguage names in fenced code blocks now support all characters\nexcept whitespace, so you can go wild with \u003ccode\u003easn.1\u003c/code\u003e and \u003ccode\u003eC#\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eA heuristic generates missing initials/surname from the \u003ccode\u003ename\u003c/code\u003e entry\nin author information. This should save a lot of redundant typing.\nYou'll need to continue using the \u003ccode\u003eins\u003c/code\u003e entry as well if that\nheuristic fails (e.g., for Spanish names).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAlso, there is some rather experimental support for markdown display\nmath (blocks between \u003ccode\u003e$$\u003c/code\u003e pairs) if the \u003ccode\u003etex2mail\u003c/code\u003e tool is available.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.23:)\nMove up to kramdown 1.6.0. This inherits a number of fixes and one\nnice feature:\nMarkdown footnote definitions that turn into \u003ccode\u003ecref\u003c/code\u003es can have their\nattributes in the footnote definition:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{:cabo: source=\u0026quot;cabo\u0026quot;}\n\n(This section to be removed by the RFC editor.)[^1]\n\n[^1]: here is my editorial comment: warble warble.\n{:cabo}\n\nAnother questionable paragraph.[^2]\n\n[^2]: so why not delete it?\n{: source=\u0026quot;observer\u0026quot;}\"\u003e\u003cpre\u003e{:cabo: source=\"cabo\"}\n\n(This section to be removed by the RFC editor.)\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e\n\n\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e: here is my editorial comment: warble warble.\n{\u003cspan class=\"pl-s\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecabo\u003c/span\u003e}\n\nAnother questionable paragraph.\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e\n\n\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e: so why not delete it?\n{: source=\"observer\"}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(1.0.23:)\nAs before, IAL attributes on a codeblock go to the figure element.\nLanguage attributes on the code block now become the artwork type, and any\nattribute with a name that starts \"artwork-\" is moved over to the artwork.\nSo this snippet now does the obvious things:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"~~~ abnf\na = b / %s\u0026quot;foo\u0026quot; / %x0D.0A\n~~~\n{: artwork-align=\u0026quot;center\u0026quot; artwork-name=\u0026quot;syntax\u0026quot;}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s\"\u003e~~~\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eabnf\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003ea = b / %s\"foo\" / %x0D.0A\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e~~~\u003c/span\u003e\n{: artwork-align=\"center\" artwork-name=\"syntax\"}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(1.0.22:)\nIndex entries can be created with \u003ccode\u003e(((item)))\u003c/code\u003e or\n\u003ccode\u003e(((item, subitem)))\u003c/code\u003e; use quotes for weird entries: \u003ccode\u003e(((\",\", comma)))\u003c/code\u003e.\nIf the index entry is to be marked \"primary\", prefix an (unquoted) \u003ccode\u003e!\u003c/code\u003e\nas in \u003ccode\u003e(((!item)))\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn addition, auto-indexing is supported by hijacking the kramdown\n\"abbrev\" syntax:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"*[IANA]:\n*[MUST]: BCP14\n*[CBOR]: (((Object Representation, Concise Binary))) (((CBOR)))\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e*[IANA]:\n*[MUST]: BCP14\n*[CBOR]: (((Object Representation, Concise Binary))) (((CBOR)))\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe word in square brackets (which must match exactly,\ncase-sensitively) is entered into the index automatically for each\nplace where it occurs. If no title is given, just the word is entered\n(first example). If one is given, that becomes the main item (the\nauto-indexed word becomes the subitem, second example). If full\ncontrol is desired (e.g., for multiple entries per occurrence), just\nwrite down the full index entries instead (third example).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.20:)\nAs an alternative referencing syntax for references with text,\n\u003ccode\u003e{{ref}}\u003c/code\u003e can be expressed as \u003ccode\u003e[text](#ref)\u003c/code\u003e. As a special case, a\nsimple \u003ccode\u003e[ref]\u003c/code\u003e is interpreted as \u003ccode\u003e[](#ref)\u003c/code\u003e (except that the latter\nsyntax is not actually allowed by kramdown). This syntax does not\nallow for automatic entry of items as normative/informative.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.16:) Markdown footnotes are converted into \u003ccode\u003ecref\u003c/code\u003es (XML2RFC formal\ncomments; note that these are only visible if the pi \"comments\" is set to yes).\nThe anchor is taken from the markdown footnote name. The source, if\nneeded, can be supplied by an \u003ca href=\"https://kramdown.gettalong.org/syntax.html#inline-attribute-lists\" rel=\"nofollow\"\u003eIAL\u003c/a\u003e, as in (first example also uses an\n\u003ca href=\"https://kramdown.gettalong.org/syntax.html#attribute-list-definitions\" rel=\"nofollow\"\u003eALD\u003c/a\u003e):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{:cabo: source=\u0026quot;cabo\u0026quot;}\n\n(This section to be removed by the RFC editor.)[^1]{:cabo}\n\n[^1]: here is my editorial comment\n\nAnother questionable paragraph.[^2]{: source=\u0026quot;observer\u0026quot;}\n\n[^2]: so why not delete it\"\u003e\u003cpre\u003e{:cabo: source=\"cabo\"}\n\n(This section to be removed by the RFC editor.)\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e{\u003cspan class=\"pl-s\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecabo\u003c/span\u003e}\n\n\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e: here is my editorial comment\n\nAnother questionable paragraph.\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e{: source=\"observer\"}\n\n\u003cspan class=\"pl-s\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e^\u003c/span\u003e\u003cspan class=\"pl-en\"\u003e2\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e]\u003c/span\u003e: so why not delete it\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that XML2RFC v2 doesn't allow structure in crefs. If you put any,\nyou get the escaped verbatim XML...\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.11:) Allow overriding \"style\" attribute (via IAL =\n\u003ca href=\"https://kramdown.gettalong.org/syntax.html#inline-attribute-lists\" rel=\"nofollow\"\u003einline attribute list\u003c/a\u003e) in lists and spans\nas in:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{:req: counter=\u0026quot;bar\u0026quot; style=\u0026quot;format R(%d)\u0026quot;}\n\n{: req}\n* Foo\n* Bar\n* Bax\n\nText outside the list, so a new IAL is needed.\n\n* Foof\n* Barf\n* Barx\n{: req}\"\u003e\u003cpre\u003e{:req: counter=\"bar\" style=\"format R(%d)\"}\n\n{: req}\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Foo\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Bar\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Bax\n\nText outside the list, so a new IAL is needed.\n\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Foof\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Barf\n\u003cspan class=\"pl-v\"\u003e*\u003c/span\u003e Barx\n{: req}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(1.0.5:) An IAL attribute \"cols\" can be added to tables to override\nthe column layout. For example, \u003ccode\u003ecols=\"* 20 30c r\"\u003c/code\u003e sets the width attributes to\n20 and 30 for the middle columns and sets the right two columns to\ncenter and right alignment, respectively. The alignment from \u003ccode\u003ecols\u003c/code\u003e\noverrides that from the kramdown table, if present.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(1.0.2:) An IAL attribute \"vspace\" can be added to a definition list\nto break after the definition term:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{: vspace=\u0026quot;0\u0026quot;}\nword:\n: definition\n\nanotherword:\n: another definition\"\u003e\u003cpre\u003e{: vspace=\"0\"}\nword:\n: definition\n\nanotherword:\n: another definition\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(0.x:) Files can be included with the syntax \u003ccode\u003e{::include fn}\u003c/code\u003e (needs\nto be in column 1 since 1.0.22; can be suppressed for use in servers\nby setting environment variable KRAMDOWN_SAFE since 1.0.22). A\ntypical example from a recent RFC, where the contents of a figure was\nmachine-generated:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"~~~~~~~~~~\n{::include ../ghc/packets-new/p4.out}\n~~~~~~~~~~\n{: #example2 title=\u0026quot;A longer RPL example\u0026quot;}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s\"\u003e~~~~~~~~~~\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e{::include ../ghc/packets-new/p4.out}\u003c/span\u003e\n\u003cspan class=\"pl-c1\"\u003e\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e~~~~~~~~~~\u003c/span\u003e\n{: #example2 title=\"A longer RPL example\"}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e(0.x:) A page break can be forced by adding a horizontal rule (\u003ccode\u003e----\u003c/code\u003e,\nnote that this creates ugly blank space in some HTML converters).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRisks and Side-Effects\u003c/h1\u003e\u003ca id=\"user-content-risks-and-side-effects\" class=\"anchor\" aria-label=\"Permalink: Risks and Side-Effects\" href=\"#risks-and-side-effects\"\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 code is not very polished, but now quite stable; it has been\nsuccessfully used for hundreds of non-trivial Internet-Drafts and RFCs.\nYou probably still need to\nskim \u003ca href=\"https://authors.ietf.org/rfcxml-vocabulary\" rel=\"nofollow\"\u003ev3\u003c/a\u003e if you want to write an Internet-Draft, but you\ndon't really need to understand XML very much. Knowing the basics of\nYAML helps with the metadata (but you'll understand it from the\nexamples).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOccasionally, you do need to reach through to the XML arcana, e.g. by\nsetting attribute values using kramdown's \u003ca href=\"https://kramdown.gettalong.org/syntax.html#inline-attribute-lists\" rel=\"nofollow\"\u003e\"IAL\" syntax\u003c/a\u003e.\nThis can for instance be used to obtain unnumbered appendices:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Acknowledgements\n================\n{: numbered=\u0026quot;false\u0026quot;}\n\nJohn Mattsson was nice enough to point out the need for this being documented.\"\u003e\u003cpre\u003eAcknowledgements\n\u003cspan class=\"pl-mh\"\u003e================\u003c/span\u003e\n{: numbered=\"false\"}\n\nJohn Mattsson was nice enough to point out the need for this being documented.\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that this specific example is covered by a predefined\nkramdown-rfc \u003ca href=\"https://kramdown.gettalong.org/syntax.html#attribute-list-definitions\" rel=\"nofollow\"\u003e\"attribute list definition\" (ALD)\u003c/a\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"{:unnumbered: numbered=\u0026quot;false\u0026quot;}\"\u003e\u003cpre\u003e{:unnumbered: numbered=\"false\"}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eso the conventional way to write this example would be the somewhat simpler:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Acknowledgements\n================\n{:unnumbered}\n\nJohn Mattsson was nice enough to point out the need for this being documented.\"\u003e\u003cpre\u003eAcknowledgements\n\u003cspan class=\"pl-mh\"\u003e================\u003c/span\u003e\n{\u003cspan class=\"pl-s\"\u003e:\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eunnumbered\u003c/span\u003e}\n\nJohn Mattsson was nice enough to point out the need for this being documented.\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUpconversion\u003c/h1\u003e\u003ca id=\"user-content-upconversion\" class=\"anchor\" aria-label=\"Permalink: Upconversion\" href=\"#upconversion\"\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 you have an old RFC and want to convert it to markdown, try just\nusing that RFC, it is 80 % there. It may be possible to automate the\nremaining 20 % some more, but that hasn't been done.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you have XML, there is an experimental upconverter that does 99 %\nof the work. Please \u003ca href=\"mailto:cabo@tzi.org?subject=Markdown%20for%20RFCXML\"\u003econtact the\nauthor\u003c/a\u003e if you want\nto try it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eActually, if the XML was generated by kramdown-rfc, you can simply\nextract the input markdown from that XML file (but will of course lose\nany edits that have been made to the XML file after generation):\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"kramdown-rfc-extract-markdown myfile.xml \u0026gt;myfile.md\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ekramdown-rfc-extract-markdown myfile.xml \u0026gt;myfile.md\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTools\u003c/h1\u003e\u003ca id=\"user-content-tools\" class=\"anchor\" aria-label=\"Permalink: Tools\" href=\"#tools\"\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\"\u003eJoe Hildebrand has a\n\u003ca href=\"http://gruntjs.com\" rel=\"nofollow\"\u003egrunt\u003c/a\u003e plugin for kramdown-rfc at:\n\u003ca href=\"https://github.com/hildjj/grunt-kramdown-rfc2629\"\u003ehttps://github.com/hildjj/grunt-kramdown-rfc2629\u003c/a\u003e\n.\nGet started with it at:\n\u003ca href=\"https://github.com/hildjj/grunt-init-rfc\"\u003ehttps://github.com/hildjj/grunt-init-rfc\u003c/a\u003e\n.\nThis provides a self-refreshing web page with the\nkramdown-rfc/xml2rfc rendition of the draft you are editing.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMartin Thomson has an \u003ca href=\"https://github.com/martinthomson/i-d-template\"\u003eI-D Template\u003c/a\u003e for github repositories that enable\ncollaboration on draft development.\nThis supports kramdown-rfc out of the\nbox. Just name your draft like \u003ccode\u003edraft-ietf-unicorn-protocol.md\u003c/code\u003e and\nfollow the installation instructions.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRelated Work\u003c/h1\u003e\u003ca id=\"user-content-related-work\" class=\"anchor\" aria-label=\"Permalink: Related Work\" href=\"#related-work\"\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\"\u003eMoving from XML to Markdown for RFC writing apparently is a\nno-brainer, so I'm not the only one who has written code for this.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"http://www.miek.nl/\" rel=\"nofollow\"\u003eMiek Gieben\u003c/a\u003e has done a \u003ca href=\"https://github.com/miekg/pandoc2rfc/\"\u003esimilar thing\u003c/a\u003e employing\npandoc, now documented in \u003ca href=\"http://tools.ietf.org/html/rfc7328\" rel=\"nofollow\"\u003eRFC 7328\u003c/a\u003e. He uses multiple input files instead of\nkramdown-rfc's sectionized input format. He keeps the metadata in\na separate XML file, similar to the way the previous version of\nkramdown-rfc stored (and still can store) the metadata in XML in\nthe markdown document. He also uses a slightly different referencing\nsyntax, which is closer to what markdown does elsewhere but more\nverbose (this syntax is now also supported in kramdown-rfc).\n(Miek now also has a new thing going on with mostly different syntax,\nsee \u003ca href=\"https://mmark.nl\" rel=\"nofollow\"\u003emmark\u003c/a\u003e and its \u003ca href=\"https://github.com/miekg/mmark\"\u003egithub repository\u003c/a\u003e.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther human-oriented markup input languages that are being used for authoring RFCXML include:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"http://www.methods.co.nz/asciidoc/\" rel=\"nofollow\"\u003easciidoc\u003c/a\u003e, with the \u003ca href=\"https://github.com/metanorma/asciidoctor-rfc\"\u003easciidoctor-rfc\u003c/a\u003e tool, as documented in \u003ca href=\"https://tools.ietf.org/html/draft-ribose-asciirfc\" rel=\"nofollow\"\u003edraft-ribose-asciirfc\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"http://orgmode.org\" rel=\"nofollow\"\u003eorgmode\u003c/a\u003e (please help supply a more specific link here).\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h1\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\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\"\u003eSince kramdown version 1.0, kramdown itself is MIT licensed, which\nmade it possible to license kramdown-rfc under the same license.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"kramdown-rfc","anchor":"kramdown-rfc","htmlText":"kramdown-rfc"},{"level":1,"text":"Usage","anchor":"usage","htmlText":"Usage"},{"level":1,"text":"Versions of RFCXML","anchor":"versions-of-rfcxml","htmlText":"Versions of RFCXML"},{"level":1,"text":"Examples","anchor":"examples","htmlText":"Examples"},{"level":1,"text":"The YAML header","anchor":"the-yaml-header","htmlText":"The YAML 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QkQOb 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">kramdown-rfc</h1><a id="user-content-kramdown-rfc" class="anchor" aria-label="Permalink: kramdown-rfc" href="#kramdown-rfc"><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 href="https://kramdown.gettalong.org" rel="nofollow">kramdown</a> is a <a href="http://en.wikipedia.org/wiki/Markdown" rel="nofollow">markdown</a> parser by Thomas Leitner, which has a number of backends for generating HTML, Latex, and markdown again.</p> <p dir="auto"><strong>kramdown-rfc</strong> is an additional backend to that: It allows the generation of <a href="https://github.com/ietf-tools/xml2rfc">XML2RFC</a> XML markup (originally known as <a href="https://www.rfc-editor.org/rfc/rfc2629.html" rel="nofollow">RFC 2629</a> compliant markup, with a newer version documented in <a href="https://www.rfc-editor.org/rfc/rfc7749.html" rel="nofollow">RFC 7749</a>; version 3 now documented in <a href="https://www.rfc-editor.org/rfc/rfc7991.html" rel="nofollow">RFC 7991</a> etc. and <a href="https://authors.ietf.org/rfcxml-vocabulary" rel="nofollow">v3</a>).</p> <p dir="auto">Who would care? Anybody who is writing Internet-Drafts and RFCs in the <a href="http://www.ietf.org" rel="nofollow">IETF</a> and prefers (or has co-authors who prefer) to do part of their work in markdown.</p> <p dir="auto">kramdown-rfc is documented on this page, and also on <a href="https://github.com/cabo/kramdown-rfc/wiki">the wiki</a>.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Usage</h1><a id="user-content-usage" class="anchor" aria-label="Permalink: Usage" href="#usage"><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">Start by installing the kramdown-rfc gem (this automatically installs appropriate versions of referenced gems such as kramdown as well):</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="gem install kramdown-rfc"><pre class="notranslate"><code>gem install kramdown-rfc </code></pre></div> <p dir="auto">(Add a <code>sudo</code> and a space in front of that command if you don't have all the permissions needed.)</p> <p dir="auto">The guts of kramdown-rfc are in one Ruby file, <code>lib/kramdown-rfc2629.rb</code> --- this melds nicely into the extension structure provided by kramdown. <code>bin/kramdown-rfc</code> started out as a simple command-line program showing how to use this, but can now do much more (see below).</p> <p dir="auto">To use kramdown-rfc, you'll need Ruby (at least version 2.3, but preferably a current version), and maybe <a href="https://github.com/ietf-tools/xml2rfc">XML2RFC</a> if you want to see the fruits of your work.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="kramdown-rfc mydraft.md >mydraft.xml xml2rfc mydraft.xml"><pre class="notranslate"><code>kramdown-rfc mydraft.md >mydraft.xml xml2rfc mydraft.xml </code></pre></div> <p dir="auto">(The most popular file name extension that IETF people have for markdown is .md -- for those who tend to think about GNU machine descriptions here, any extension such as .mkd will do, too.)</p> <p dir="auto">A more brief interface for both calling kramdown-rfc and XML2RFC is provided by <code>kdrfc</code>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="kdrfc mydraft.md"><pre class="notranslate"><code>kdrfc mydraft.md </code></pre></div> <p dir="auto"><code>kdrfc</code> can also use a remote installation of XML2RFC if needed:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="kdrfc -r mydraft.md"><pre class="notranslate"><code>kdrfc -r mydraft.md </code></pre></div> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Versions of RFCXML</h1><a id="user-content-versions-of-rfcxml" class="anchor" aria-label="Permalink: Versions of RFCXML" href="#versions-of-rfcxml"><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">Since RFC 8650, RFCs are using an updated grammar as defined in RFC 7991 to 7998 and further updated informally since, colloquially called "<a href="https://authors.ietf.org/rfcxml-vocabulary" rel="nofollow">v3</a>". As RFC 2629 is no longer the governing standard, what was called kramdown-rfc2629 is now called kramdown-rfc. The latter command defaults to v3 processing rules; from 2022-02-22T22:02:22 on, the old kramdown-rfc2629 driver program does as well (1.6.1). (-3/--v3 and -2/--v2 select v3 and v2 explicitly; the latter should only be needed if there is a reason to to make a document look like it's 2016.)</p> <p dir="auto">See also <a href="https://mailarchive.ietf.org/arch/msg/rfc-markdown/JC__LDDGuUbSFqyaEntF9r4kwKw" rel="nofollow">v3 announcement mail</a>.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Examples</h1><a id="user-content-examples" class="anchor" aria-label="Permalink: Examples" href="#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">For historical interest <code>stupid.mkd</code> was an early markdown version of an actual Internet-Draft (for a protocol called <a href="http://tools.ietf.org/id/draft-hartke-xmpp-stupid-00" rel="nofollow">STuPiD</a> [sic!]). This demonstrated some, but not all features of kramdown-rfc. Since markdown/kramdown does not cater for all the structure of an RFC 7991 style document, some of the markup is in XML, and the example switches between XML and markdown using kramdown's <code>{::nomarkdown}</code> and <code>{:/nomarkdown}</code> (this is ugly, but works well enough). <code>stupid.xml</code> and <code>stupid.txt</code> show what kramdown-rfc and xml2rfc make out of this.</p> <p dir="auto"><code>stupid-s.mkd</code> is the same document in the new sectionized format supported by kramdown-rfc. The document metadata are in a short piece of YAML at the start, and from there, <code>abstract</code>, <code>middle</code>, references (<code>normative</code> and <code>informative</code>) and <code>back</code> are sections delimited in the markdown file. See the example for how this works. The sections <code>normative</code> and <code>informative</code> can be populated right from the metadata, so there is never a need to write XML any more. Much less scary, and no <code>{:/nomarkdown}</code> etc. is needed any more. Similarly, <code>stupid-s.xml</code> and <code>stupid-s.txt</code> show what kramdown-rfc and xml2rfc make out of this.</p> <p dir="auto"><code>draft-ietf-core-block-xx.mkd</code> is a real-world example of a current Internet-Draft done this way. For RFC and Internet-Draft references, it uses document prolog entities instead of caching the references in the XML (i.e., not standalone mode, this is easier to handle when collaborating with XML-only co-authors). See the <code>bibxml</code> metadata.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">The YAML header</h1><a id="user-content-the-yaml-header" class="anchor" aria-label="Permalink: The YAML header" href="#the-yaml-header"><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">Please consult the examples for the structure of the YAML header, this should be mostly obvious. The <code>stand_alone</code> attribute controls whether the RFC/I-D references are inserted into the document (yes) or entity-referenced (no), the latter leads to increased build time, but may be more palatable for a final XML conversion. The author entry can be a single hash or a list, as in:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="author: ins: C. Bormann name: Carsten Bormann org: Universität Bremen TZI abbrev: TZI street: Bibliothekstr. 1 city: Bremen code: D-28359 country: Germany phone: +49-421-218-63921 email: cabo@tzi.org"><pre class="notranslate"><code>author: ins: C. Bormann name: Carsten Bormann org: Universität Bremen TZI abbrev: TZI street: Bibliothekstr. 1 city: Bremen code: D-28359 country: Germany phone: +49-421-218-63921 email: cabo@tzi.org </code></pre></div> <p dir="auto">or</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="author: - ins: C. Bormann name: Carsten Bormann org: Universität Bremen TZI email: cabo@tzi.org - ins: Z. Shelby name: Zach Shelby org: Sensinode role: editor street: Kidekuja 2 city: Vuokatti code: 88600 country: Finland phone: "+358407796297" email: zach@sensinode.com - role: editor ins: P. Thubert name: Pascal Thubert org: Cisco Systems abbrev: Cisco street: - Village d'Entreprises Green Side - 400, Avenue de Roumanille - Batiment T3 city: Biot - Sophia Antipolis code: '06410' country: FRANCE phone: "+33 4 97 23 26 34" email: pthubert@cisco.com"><pre class="notranslate"><code>author: - ins: C. Bormann name: Carsten Bormann org: Universität Bremen TZI email: cabo@tzi.org - ins: Z. Shelby name: Zach Shelby org: Sensinode role: editor street: Kidekuja 2 city: Vuokatti code: 88600 country: Finland phone: "+358407796297" email: zach@sensinode.com - role: editor ins: P. Thubert name: Pascal Thubert org: Cisco Systems abbrev: Cisco street: - Village d'Entreprises Green Side - 400, Avenue de Roumanille - Batiment T3 city: Biot - Sophia Antipolis code: '06410' country: FRANCE phone: "+33 4 97 23 26 34" email: pthubert@cisco.com </code></pre></div> <p dir="auto">(the hash keys are the XML GIs from RFC 7749, with a flattened structure. As RFC 7749 requires giving both the full name and surname/initials, we use <code>ins</code> as an abbreviation for "initials/surname". Yes, the toolchain is Unicode-capable, even if the final RFC output is still in ASCII.)</p> <p dir="auto">Note that the YAML header needs to be syntactically valid YAML. Where there is a potential for triggering some further YAML feature, a string should be put in quotes (like the "+358407796297" above, which might otherwise be interpreted as a number, losing the + sign).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">References</h2><a id="user-content-references" class="anchor" aria-label="Permalink: References" href="#references"><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 references section is built from the references listed in the YAML header and from references made inline to RFCs and I-Ds in the markdown text. Since kramdown-rfc cannot know whether a reference is normative or informative, no entry is generated by default in the references section. By indicating a normative reference as in <code>{{!RFC2119}}</code> or an informative one as in <code>{{?RFC1925}}</code>, you can completely automate the referencing, without the need to write anything in the header. Alternatively, you can write something like:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="informative: RFC1925: normative: RFC2119:"><pre class="notranslate"><code>informative: RFC1925: normative: RFC2119: </code></pre></div> <p dir="auto">and then just write <code>{{RFC2119}}</code> or <code>{{RFC1925}}</code>. (Yes, there is a colon in the YAML, because this is a hash that could provide other information.)</p> <p dir="auto">Since version 1.1, references imported from the <a href="https://bib.ietf.org/" rel="nofollow">BibXML</a> databases can be supplied with a replacement label (anchor name). E.g., RFC 793 could be referenced as <code>{{!TCP=RFC0793}}</code>, further references then just can say <code>{{TCP}}</code>; both will get <code>[TCP]</code> as the label. In the YAML, the same replacement can be expressed as in the first example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" normative: TCP: RFC0793 informative: SST: DOI.10.1145/1282427.1282421"><pre class="notranslate"><code> normative: TCP: RFC0793 informative: SST: DOI.10.1145/1282427.1282421 </code></pre></div> <p dir="auto">Notes about this feature:</p> <ul dir="auto"> <li>Thank you, Martin Thomson, for supplying an implementation and insisting this be done.</li> <li>While this feature is now available, you are not forced to use it for everything: readers of documents often benefit from not having to look up references, so continuing to use the draft names and RFC numbers as labels may be the preferable style in many cases.</li> <li>As a final caveat, renaming anchors does not work in the <code>stand_alone: no</code> mode (except for IANA and DOI), as there is no such mechanism in XML entity referencing; exporting to XML while maintaining live references then may require some manual editing to get rid of the custom anchors.</li> </ul> <p dir="auto">If your references are not in the <a href="https://bib.ietf.org/" rel="nofollow">BibXML</a> databases and do not have a DOI (that also happens to have correct data) either, you need to spell it out like in the examples below:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="informative: RFC1925: WEI: title: "6LoWPAN: the Wireless Embedded Internet" # see the quotes above? Needed because of the embedded colon. author: - ins: Z. Shelby name: Zach Shelby - ins: C. Bormann name: Carsten Bormann date: 2009 seriesinfo: ISBN: 9780470747995 ann: This is a really good reference on 6LoWPAN. ASN.1: title: > Information Technology — ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) # YAML's ">" syntax used above is a good way to write longer titles author: org: International Telecommunications Union date: 1994 seriesinfo: ITU-T: Recommendation X.690 REST: target: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf title: Architectural Styles and the Design of Network-based Software Architectures author: ins: R. Fielding name: Roy Thomas Fielding org: University of California, Irvine date: 2000 seriesinfo: "Ph.D.": "Dissertation, University of California, Irvine" format: PDF: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf COAP: title: "CoAP: An Application Protocol for Billions of Tiny Internet Nodes" seriesinfo: DOI: 10.1109/MIC.2012.29 date: 2012 author: - ins: C. Bormann name: Carsten Bormann - ins: A. P. Castellani name: Angelo P. Castellani - ins: Z. Shelby name: Zach Shelby IPSO: title: IP for Smart Objects (IPSO) author: - org: date: false seriesinfo: Web: http://ipso-alliance.github.io/pub/ normative: ECMA262: author: org: European Computer Manufacturers Association title: ECMAScript Language Specification 5.1 Edition date: 2011-06 target: http://www.ecma-international.org/publications/files/ecma-st/ECMA-262.pdf seriesinfo: ECMA: Standard ECMA-262 RFC2119: RFC6690:"><pre class="notranslate"><code>informative: RFC1925: WEI: title: "6LoWPAN: the Wireless Embedded Internet" # see the quotes above? Needed because of the embedded colon. author: - ins: Z. Shelby name: Zach Shelby - ins: C. Bormann name: Carsten Bormann date: 2009 seriesinfo: ISBN: 9780470747995 ann: This is a really good reference on 6LoWPAN. ASN.1: title: > Information Technology — ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) # YAML's ">" syntax used above is a good way to write longer titles author: org: International Telecommunications Union date: 1994 seriesinfo: ITU-T: Recommendation X.690 REST: target: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf title: Architectural Styles and the Design of Network-based Software Architectures author: ins: R. Fielding name: Roy Thomas Fielding org: University of California, Irvine date: 2000 seriesinfo: "Ph.D.": "Dissertation, University of California, Irvine" format: PDF: http://www.ics.uci.edu/~fielding/pubs/dissertation/fielding_dissertation.pdf COAP: title: "CoAP: An Application Protocol for Billions of Tiny Internet Nodes" seriesinfo: DOI: 10.1109/MIC.2012.29 date: 2012 author: - ins: C. Bormann name: Carsten Bormann - ins: A. P. Castellani name: Angelo P. Castellani - ins: Z. Shelby name: Zach Shelby IPSO: title: IP for Smart Objects (IPSO) author: - org: date: false seriesinfo: Web: http://ipso-alliance.github.io/pub/ normative: ECMA262: author: org: European Computer Manufacturers Association title: ECMAScript Language Specification 5.1 Edition date: 2011-06 target: http://www.ecma-international.org/publications/files/ecma-st/ECMA-262.pdf seriesinfo: ECMA: Standard ECMA-262 RFC2119: RFC6690: </code></pre></div> <p dir="auto">(as in the author list, <code>ins</code> is an abbreviation for "initials/surname"; note that the first title had to be put in double quotes as it contains a colon which is special syntax in YAML.) Then you can simply reference <code>{{ASN.1}}</code> and <code>{{ECMA262}}</code> in the text. (Make sure the reference keys are valid XML names, though.)</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Experimental features</h1><a id="user-content-experimental-features" class="anchor" aria-label="Permalink: Experimental features" href="#experimental-features"><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">Most of the <a href="http://kramdown.gettalong.org/syntax.html" rel="nofollow">kramdown syntax</a> is supported and does something useful; with the exception of the math syntax (math has no special support in XML2RFC), and HTML syntax of course.</p> <p dir="auto">A number of more esoteric features have recently been added. (The minimum required version for each full feature is indicated.)</p> <p dir="auto">(1.3.x) Slowly improving support for SVG generating tools for XML2RFCv3 (i.e., with <code>-3</code> flag). These tools must be installed and callable from the command line.</p> <p dir="auto">The basic idea is to mark an input code block with one of the following labels (language types), yielding some plaintext form in the .TXT output and a graphical form in the .HTML output. The plaintext is the input in some cases (e.g., ASCII art, <code>mscgen</code>), or some plaintext output generated by the tool (e.g., <code>plantuml-utxt</code>).</p> <p dir="auto">Currently supported labels as of 1.3.9:</p> <ul dir="auto"> <li><a href="https://github.com/blampe/goat">goat</a>, <a href="https://github.com/stathissideris/ditaa">ditaa</a>: ASCII (plaintext) art to figure conversion</li> <li><a href="http://www.mcternan.me.uk/mscgen/" rel="nofollow">mscgen</a>: Message Sequence Charts</li> <li><a href="https://plantuml.com" rel="nofollow">plantuml</a>: widely used multi-purpose diagram generator</li> <li>plantuml-utxt: Like plantuml, except that a plantuml-generated plaintext form is used</li> <li><a href="https://github.com/mermaid-js/mermaid-cli">mermaid</a>: Very experimental; the conversion to SVG is prone to generate black-on-black text in this version</li> <li>math: display math using <a href="https://github.com/mathjax/MathJax-demos-node/blob/master/direct/tex2svg">tex2svg</a> for HTML/PDF and <a href="https://github.com/bartp5/libtexprintf">utftex</a> for plaintext</li> </ul> <p dir="auto">Note that this feature does not play well with the CI (continuous integration) support in Martin Thomson's <a href="https://github.com/martinthomson/i-d-template">I-D Template</a>, as that may not have the tools installed in its docker instance.</p> <p dir="auto">More details have been collected on the <a href="https://github.com/cabo/kramdown-rfc/wiki/SVG">wiki</a>.</p> <p dir="auto">(1.2.9:) The YAML header now allows specifying <a href="https://kramdown.gettalong.org/options.html" rel="nofollow">kramdown_options</a>.</p> <p dir="auto">This was added specifically to provide easier access to the kramdown <code>auto_id_prefix</code> feature, which prefixes by some distinguishing string the anchors that are auto-generated for sections, avoiding conflicts:</p> <div class="highlight highlight-source-yaml notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="kramdown_options: auto_id_prefix: sec-"><pre><span class="pl-ent">kramdown_options</span>: <span class="pl-ent">auto_id_prefix</span>: <span class="pl-s">sec-</span></pre></div> <p dir="auto">(1.2.8:) An experimental feature was added to include <a href="https://www.rfc-editor.org/info/bcp14" rel="nofollow">BCP 14</a> boilerplate:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{::boilerplate bcp14}"><pre>{::boilerplate bcp14}</pre></div> <p dir="auto">which saves some typing. Saying "bcp14+" instead of "bcp14" adds some random clarifications at the end of the <a href="https://tools.ietf.org/html/rfc8174#page-3" rel="nofollow">standard boilerplate text</a> that you may or may not want to have. (Do we need other boilerplate items beyond BCP14?)</p> <p dir="auto">(1.0.35:) An experimental command <code>doilit</code> has been added. It can be used to convert DOIs given on the command line into references entries for kramdown-rfc YAML, saving a lot of typing. Note that the DOI database is not of very consistent quality, so you likely have to hand-edit the result before including it into the document (use <code>-v</code> to see raw JSON data from the DOI database, made somewhat readable by converting it into YAML). Use <code>-c</code> to enable caching (requires <code>open-uri-cached</code> gem). Use <code>-h=handle</code> in front of a DOI to set a handle different from the default <code>a</code>, <code>b</code>, etc. Similarly, use <code>-x=handle</code> to generate XML2RFCv2 XML instead of kramdown-rfc YAML.</p> <p dir="auto">(1.0.31:) The kramdown <code>smart_quotes</code> feature can be controlled better. By default, it is on (with default kramdown settings), unless <code>coding: us-ascii</code> is in effect (1.3.14: or --v3 is given), in which case it is off by default. It also can be explicitly set on (<code>true</code>) or off (<code>false</code>) in the YAML header, or to a specific value (an array of four kramdown entity names or character numbers). E.g., for a German text (that is not intended to become an Internet-Draft), one might write:</p> <div class="highlight highlight-source-yaml notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="smart_quotes: [sbquo, lsquo, bdquo, ldquo] pi: topblock: no private: yes"><pre><span class="pl-ent">smart_quotes</span>: <span class="pl-s">[sbquo, lsquo, bdquo, ldquo]</span> <span class="pl-ent">pi</span>: <span class="pl-ent">topblock</span>: <span class="pl-s">no</span> <span class="pl-ent">private</span>: <span class="pl-s">yes</span></pre></div> <p dir="auto">(1.0.30:) kramdown-rfc now uses kramdown 1.10, which leads to two notable updates:</p> <ul dir="auto"> <li>Support for empty link texts in the standard markdown reference syntax, as in <code>[](#RFC7744)</code>.</li> <li>Language names in fenced code blocks now support all characters except whitespace, so you can go wild with <code>asn.1</code> and <code>C#</code>.</li> </ul> <p dir="auto">A heuristic generates missing initials/surname from the <code>name</code> entry in author information. This should save a lot of redundant typing. You'll need to continue using the <code>ins</code> entry as well if that heuristic fails (e.g., for Spanish names).</p> <p dir="auto">Also, there is some rather experimental support for markdown display math (blocks between <code>$$</code> pairs) if the <code>tex2mail</code> tool is available.</p> <p dir="auto">(1.0.23:) Move up to kramdown 1.6.0. This inherits a number of fixes and one nice feature: Markdown footnote definitions that turn into <code>cref</code>s can have their attributes in the footnote definition:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{:cabo: source="cabo"} (This section to be removed by the RFC editor.)[^1] [^1]: here is my editorial comment: warble warble. {:cabo} Another questionable paragraph.[^2] [^2]: so why not delete it? {: source="observer"}"><pre>{:cabo: source="cabo"} (This section to be removed by the RFC editor.)<span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">1</span><span class="pl-s">]</span> <span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">1</span><span class="pl-s">]</span>: here is my editorial comment: warble warble. {<span class="pl-s">:</span><span class="pl-en">cabo</span>} Another questionable paragraph.<span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">2</span><span class="pl-s">]</span> <span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">2</span><span class="pl-s">]</span>: so why not delete it? {: source="observer"}</pre></div> <p dir="auto">(1.0.23:) As before, IAL attributes on a codeblock go to the figure element. Language attributes on the code block now become the artwork type, and any attribute with a name that starts "artwork-" is moved over to the artwork. So this snippet now does the obvious things:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="~~~ abnf a = b / %s"foo" / %x0D.0A ~~~ {: artwork-align="center" artwork-name="syntax"}"><pre><span class="pl-s">~~~</span> <span class="pl-en">abnf</span><span class="pl-c1"></span> <span class="pl-c1">a = b / %s"foo" / %x0D.0A</span> <span class="pl-c1"></span><span class="pl-s">~~~</span> {: artwork-align="center" artwork-name="syntax"}</pre></div> <p dir="auto">(1.0.22:) Index entries can be created with <code>(((item)))</code> or <code>(((item, subitem)))</code>; use quotes for weird entries: <code>(((",", comma)))</code>. If the index entry is to be marked "primary", prefix an (unquoted) <code>!</code> as in <code>(((!item)))</code>.</p> <p dir="auto">In addition, auto-indexing is supported by hijacking the kramdown "abbrev" syntax:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="*[IANA]: *[MUST]: BCP14 *[CBOR]: (((Object Representation, Concise Binary))) (((CBOR)))"><pre class="notranslate"><code>*[IANA]: *[MUST]: BCP14 *[CBOR]: (((Object Representation, Concise Binary))) (((CBOR))) </code></pre></div> <p dir="auto">The word in square brackets (which must match exactly, case-sensitively) is entered into the index automatically for each place where it occurs. If no title is given, just the word is entered (first example). If one is given, that becomes the main item (the auto-indexed word becomes the subitem, second example). If full control is desired (e.g., for multiple entries per occurrence), just write down the full index entries instead (third example).</p> <p dir="auto">(1.0.20:) As an alternative referencing syntax for references with text, <code>{{ref}}</code> can be expressed as <code>[text](#ref)</code>. As a special case, a simple <code>[ref]</code> is interpreted as <code>[](#ref)</code> (except that the latter syntax is not actually allowed by kramdown). This syntax does not allow for automatic entry of items as normative/informative.</p> <p dir="auto">(1.0.16:) Markdown footnotes are converted into <code>cref</code>s (XML2RFC formal comments; note that these are only visible if the pi "comments" is set to yes). The anchor is taken from the markdown footnote name. The source, if needed, can be supplied by an <a href="https://kramdown.gettalong.org/syntax.html#inline-attribute-lists" rel="nofollow">IAL</a>, as in (first example also uses an <a href="https://kramdown.gettalong.org/syntax.html#attribute-list-definitions" rel="nofollow">ALD</a>):</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{:cabo: source="cabo"} (This section to be removed by the RFC editor.)[^1]{:cabo} [^1]: here is my editorial comment Another questionable paragraph.[^2]{: source="observer"} [^2]: so why not delete it"><pre>{:cabo: source="cabo"} (This section to be removed by the RFC editor.)<span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">1</span><span class="pl-s">]</span>{<span class="pl-s">:</span><span class="pl-en">cabo</span>} <span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">1</span><span class="pl-s">]</span>: here is my editorial comment Another questionable paragraph.<span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">2</span><span class="pl-s">]</span>{: source="observer"} <span class="pl-s">[</span><span class="pl-s">^</span><span class="pl-en">2</span><span class="pl-s">]</span>: so why not delete it</pre></div> <p dir="auto">Note that XML2RFC v2 doesn't allow structure in crefs. If you put any, you get the escaped verbatim XML...</p> <p dir="auto">(1.0.11:) Allow overriding "style" attribute (via IAL = <a href="https://kramdown.gettalong.org/syntax.html#inline-attribute-lists" rel="nofollow">inline attribute list</a>) in lists and spans as in:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{:req: counter="bar" style="format R(%d)"} {: req} * Foo * Bar * Bax Text outside the list, so a new IAL is needed. * Foof * Barf * Barx {: req}"><pre>{:req: counter="bar" style="format R(%d)"} {: req} <span class="pl-v">*</span> Foo <span class="pl-v">*</span> Bar <span class="pl-v">*</span> Bax Text outside the list, so a new IAL is needed. <span class="pl-v">*</span> Foof <span class="pl-v">*</span> Barf <span class="pl-v">*</span> Barx {: req}</pre></div> <p dir="auto">(1.0.5:) An IAL attribute "cols" can be added to tables to override the column layout. For example, <code>cols="* 20 30c r"</code> sets the width attributes to 20 and 30 for the middle columns and sets the right two columns to center and right alignment, respectively. The alignment from <code>cols</code> overrides that from the kramdown table, if present.</p> <p dir="auto">(1.0.2:) An IAL attribute "vspace" can be added to a definition list to break after the definition term:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{: vspace="0"} word: : definition anotherword: : another definition"><pre>{: vspace="0"} word: : definition anotherword: : another definition</pre></div> <p dir="auto">(0.x:) Files can be included with the syntax <code>{::include fn}</code> (needs to be in column 1 since 1.0.22; can be suppressed for use in servers by setting environment variable KRAMDOWN_SAFE since 1.0.22). A typical example from a recent RFC, where the contents of a figure was machine-generated:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="~~~~~~~~~~ {::include ../ghc/packets-new/p4.out} ~~~~~~~~~~ {: #example2 title="A longer RPL example"}"><pre><span class="pl-s">~~~~~~~~~~</span><span class="pl-c1"></span> <span class="pl-c1">{::include ../ghc/packets-new/p4.out}</span> <span class="pl-c1"></span><span class="pl-s">~~~~~~~~~~</span> {: #example2 title="A longer RPL example"}</pre></div> <p dir="auto">(0.x:) A page break can be forced by adding a horizontal rule (<code>----</code>, note that this creates ugly blank space in some HTML converters).</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Risks and Side-Effects</h1><a id="user-content-risks-and-side-effects" class="anchor" aria-label="Permalink: Risks and Side-Effects" href="#risks-and-side-effects"><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 code is not very polished, but now quite stable; it has been successfully used for hundreds of non-trivial Internet-Drafts and RFCs. You probably still need to skim <a href="https://authors.ietf.org/rfcxml-vocabulary" rel="nofollow">v3</a> if you want to write an Internet-Draft, but you don't really need to understand XML very much. Knowing the basics of YAML helps with the metadata (but you'll understand it from the examples).</p> <p dir="auto">Occasionally, you do need to reach through to the XML arcana, e.g. by setting attribute values using kramdown's <a href="https://kramdown.gettalong.org/syntax.html#inline-attribute-lists" rel="nofollow">"IAL" syntax</a>. This can for instance be used to obtain unnumbered appendices:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Acknowledgements ================ {: numbered="false"} John Mattsson was nice enough to point out the need for this being documented."><pre>Acknowledgements <span class="pl-mh">================</span> {: numbered="false"} John Mattsson was nice enough to point out the need for this being documented.</pre></div> <p dir="auto">Note that this specific example is covered by a predefined kramdown-rfc <a href="https://kramdown.gettalong.org/syntax.html#attribute-list-definitions" rel="nofollow">"attribute list definition" (ALD)</a>:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="{:unnumbered: numbered="false"}"><pre>{:unnumbered: numbered="false"}</pre></div> <p dir="auto">so the conventional way to write this example would be the somewhat simpler:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Acknowledgements ================ {:unnumbered} John Mattsson was nice enough to point out the need for this being documented."><pre>Acknowledgements <span class="pl-mh">================</span> {<span class="pl-s">:</span><span class="pl-en">unnumbered</span>} John Mattsson was nice enough to point out the need for this being documented.</pre></div> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Upconversion</h1><a id="user-content-upconversion" class="anchor" aria-label="Permalink: Upconversion" href="#upconversion"><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 you have an old RFC and want to convert it to markdown, try just using that RFC, it is 80 % there. It may be possible to automate the remaining 20 % some more, but that hasn't been done.</p> <p dir="auto">If you have XML, there is an experimental upconverter that does 99 % of the work. Please <a href="mailto:cabo@tzi.org?subject=Markdown%20for%20RFCXML">contact the author</a> if you want to try it.</p> <p dir="auto">Actually, if the XML was generated by kramdown-rfc, you can simply extract the input markdown from that XML file (but will of course lose any edits that have been made to the XML file after generation):</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="kramdown-rfc-extract-markdown myfile.xml >myfile.md"><pre class="notranslate"><code>kramdown-rfc-extract-markdown myfile.xml >myfile.md </code></pre></div> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Tools</h1><a id="user-content-tools" class="anchor" aria-label="Permalink: Tools" href="#tools"><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">Joe Hildebrand has a <a href="http://gruntjs.com" rel="nofollow">grunt</a> plugin for kramdown-rfc at: <a href="https://github.com/hildjj/grunt-kramdown-rfc2629">https://github.com/hildjj/grunt-kramdown-rfc2629</a> . Get started with it at: <a href="https://github.com/hildjj/grunt-init-rfc">https://github.com/hildjj/grunt-init-rfc</a> . This provides a self-refreshing web page with the kramdown-rfc/xml2rfc rendition of the draft you are editing.</p> <p dir="auto">Martin Thomson has an <a href="https://github.com/martinthomson/i-d-template">I-D Template</a> for github repositories that enable collaboration on draft development. This supports kramdown-rfc out of the box. Just name your draft like <code>draft-ietf-unicorn-protocol.md</code> and follow the installation instructions.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Related Work</h1><a id="user-content-related-work" class="anchor" aria-label="Permalink: Related Work" href="#related-work"><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">Moving from XML to Markdown for RFC writing apparently is a no-brainer, so I'm not the only one who has written code for this.</p> <p dir="auto"><a href="http://www.miek.nl/" rel="nofollow">Miek Gieben</a> has done a <a href="https://github.com/miekg/pandoc2rfc/">similar thing</a> employing pandoc, now documented in <a href="http://tools.ietf.org/html/rfc7328" rel="nofollow">RFC 7328</a>. He uses multiple input files instead of kramdown-rfc's sectionized input format. He keeps the metadata in a separate XML file, similar to the way the previous version of kramdown-rfc stored (and still can store) the metadata in XML in the markdown document. He also uses a slightly different referencing syntax, which is closer to what markdown does elsewhere but more verbose (this syntax is now also supported in kramdown-rfc). (Miek now also has a new thing going on with mostly different syntax, see <a href="https://mmark.nl" rel="nofollow">mmark</a> and its <a href="https://github.com/miekg/mmark">github repository</a>.)</p> <p dir="auto">Other human-oriented markup input languages that are being used for authoring RFCXML include:</p> <ul dir="auto"> <li><a href="http://www.methods.co.nz/asciidoc/" rel="nofollow">asciidoc</a>, with the <a href="https://github.com/metanorma/asciidoctor-rfc">asciidoctor-rfc</a> tool, as documented in <a href="https://tools.ietf.org/html/draft-ribose-asciirfc" rel="nofollow">draft-ribose-asciirfc</a>.</li> <li><a href="http://orgmode.org" rel="nofollow">orgmode</a> (please help supply a more specific link here).</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">License</h1><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><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">Since kramdown version 1.0, kramdown itself is MIT licensed, which made it possible to license kramdown-rfc under the same license.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" 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