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href="#Using_a_catalog_–_Java_SAX_example"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Using a catalog – Java SAX example</span> </div> </a> <ul id="toc-Using_a_catalog_–_Java_SAX_example-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" 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Available in 3 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-3" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">3 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Cat%C3%A0leg_XML" title="Catàleg XML – Catalan" lang="ca" hreflang="ca" data-title="Catàleg XML" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/XML_katalog" title="XML katalog – Czech" lang="cs" hreflang="cs" data-title="XML katalog" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/XML_Catalogs" title="XML Catalogs – German" lang="de" hreflang="de" data-title="XML Catalogs" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2597555#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" 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cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/XML_catalog"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=XML_catalog&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=XML_catalog&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li 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href="/wiki/Special:RecentChangesLinked/XML_catalog" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=XML_catalog&oldid=1208354199" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=XML_catalog&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=XML_catalog&id=1208354199&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FXML_catalog"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FXML_catalog"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=XML_catalog&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=XML_catalog&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2597555" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div 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0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><style data-mw-deduplicate="TemplateStyles:r1248332772">.mw-parser-output .multiple-issues-text{width:95%;margin:0.2em 0}.mw-parser-output .multiple-issues-text>.mw-collapsible-content{margin-top:0.3em}.mw-parser-output .compact-ambox .ambox{border:none;border-collapse:collapse;background-color:transparent;margin:0 0 0 1.6em!important;padding:0!important;width:auto;display:block}body.mediawiki .mw-parser-output .compact-ambox .ambox.mbox-small-left{font-size:100%;width:auto;margin:0}.mw-parser-output .compact-ambox .ambox .mbox-text{padding:0!important;margin:0!important}.mw-parser-output .compact-ambox .ambox .mbox-text-span{display:list-item;line-height:1.5em;list-style-type:disc}body.skin-minerva .mw-parser-output .multiple-issues-text>.mw-collapsible-toggle,.mw-parser-output .compact-ambox .ambox .mbox-image,.mw-parser-output .compact-ambox .ambox .mbox-imageright,.mw-parser-output .compact-ambox .ambox .mbox-empty-cell,.mw-parser-output .compact-ambox .hide-when-compact{display:none}</style><table class="box-Multiple_issues plainlinks metadata ambox ambox-content ambox-multiple_issues compact-ambox" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span"><div class="multiple-issues-text mw-collapsible"><b>This article has multiple issues.</b> Please help <b><a href="/wiki/Special:EditPage/XML_catalog" title="Special:EditPage/XML catalog">improve it</a></b> or discuss these issues on the <b><a href="/wiki/Talk:XML_catalog" title="Talk:XML catalog">talk page</a></b>. <small><i>(<a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove these messages</a>)</i></small> <div class="mw-collapsible-content"> <style data-mw-deduplicate="TemplateStyles:r1248666159">.mw-parser-output .tfd-dated{font-size:85%}.mw-parser-output .tfd-default{border-bottom:1px solid var(--border-color-base,#a2a9b1);clear:both;text-align:center}.mw-parser-output .tfd-tiny{font-weight:bold}.mw-parser-output .tfd-inline{border:1px solid var(--border-color-base,#a2a9b1)}.mw-parser-output .tfd-sidebar{border-bottom:1px solid var(--border-color-base,#a2a9b1);text-align:center;position:relative}@media(min-width:640px){.mw-parser-output .tfd-sidebar{clear:right;float:right;width:22em}}</style><span class="tfd tfd-dated tfd-inline">‹The <a href="/wiki/Help:Template" title="Help:Template">template</a> <i><a href="/wiki/Template:How-to" title="Template:How-to">How-to</a></i> is being <a href="/wiki/Wikipedia:Templates_for_discussion/Log/2024_November_25#Template:How-to" title="Wikipedia:Templates for discussion/Log/2024 November 25">considered for merging</a>.›</span> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Howto plainlinks metadata ambox ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>contains <a href="/wiki/Wikipedia:What_Wikipedia_is_not#NOTHOWTO" title="Wikipedia:What Wikipedia is not">instructions, advice, or how-to content</a></b>.<span class="hide-when-compact"> Please help <a class="external text" href="https://en.wikipedia.org/w/index.php?title=XML_catalog&action=edit">rewrite the content</a> so that it is more encyclopedic or <a href="https://meta.wikimedia.org/wiki/Help:Transwiki" class="extiw" title="m:Help:Transwiki">move</a> it to <a href="https://en.wikiversity.org/wiki/" class="extiw" title="v:">Wikiversity</a>, <a href="https://en.wikibooks.org/wiki/" class="extiw" title="b:">Wikibooks</a>, or <a href="https://en.wikivoyage.org/wiki/" class="extiw" title="voy:">Wikivoyage</a>.</span> <span class="date-container"><i>(<span class="date">March 2018</span>)</i></span></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/XML_catalog" title="Special:EditPage/XML catalog">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22XML+catalog%22">"XML catalog"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22XML+catalog%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22XML+catalog%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22XML+catalog%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22XML+catalog%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22XML+catalog%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">November 2023</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> </div> </div><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p><a href="/wiki/XML" title="XML">XML</a> documents typically refer to external entities, for example the public and/or system ID for the <a href="/wiki/Document_Type_Definition" class="mw-redirect" title="Document Type Definition">Document Type Definition</a>. These external relationships are expressed using URIs, typically as URLs. </p><p>However absolute URLs only work when the network can reach them. Relying on remote resources makes XML processing susceptible to both planned and unplanned network downtime. </p><p>Relative URLs are only useful in the context where they were initially created. For example, the URL "../../xml/dtd/docbookx.xml" will usually only be useful in very limited circumstances. </p><p>One way to avoid these problems is to use an entity resolver (a standard part of <a href="/wiki/Simple_API_for_XML" title="Simple API for XML">SAX</a>) or a URI Resolver (a standard part of <a href="/wiki/JAXP" class="mw-redirect" title="JAXP">JAXP</a>). A resolver can examine the URIs of the resources being requested and determine how best to satisfy those requests. The <b>XML catalog</b> is a document describing a mapping between external entity references and locally cached equivalents.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Example_Catalog.xml">Example Catalog.xml</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=XML_catalog&action=edit&section=1" title="Edit section: Example Catalog.xml"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The following simple catalog shows how one might provide locally cached DTDs for an XHTML page validation tool, for example. </p> <div class="mw-highlight mw-highlight-lang-xml mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span> <span class="w"> </span><span class="cp"><?xml version="1.0"?></span> <span class="w"> </span><span class="cp"><!DOCTYPE catalog</span> <span class="cp"> PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN"</span> <span class="cp"> "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd"></span> <span class="w"> </span><span class="nt"><catalog</span><span class="w"> </span><span class="na">xmlns=</span><span class="s">"urn:oasis:names:tc:entity:xmlns:xml:catalog"</span> <span class="w"> </span><span class="na">prefer=</span><span class="s">"public"</span><span class="nt">></span> <span class="w"> </span><span class="nt"><public</span><span class="w"> </span><span class="na">publicId=</span><span class="s">"-//W3C//DTD XHTML 1.0 Strict//EN"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml1/xhtml1-strict.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"><public</span><span class="w"> </span><span class="na">publicId=</span><span class="s">"-//W3C//DTD XHTML 1.0 Transitional//EN"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml1/xhtml1-transitional.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"><public</span><span class="w"> </span><span class="na">publicId=</span><span class="s">"-//W3C//DTD XHTML 1.1//EN"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml11/xhtml11-flat.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"></catalog></span> </pre></div> <p>This catalog makes it possible to resolve <code>-//W3C//DTD XHTML 1.0 Strict//EN</code> to the local URI <code>dtd/xhtml1/xhtml1-strict.dtd</code>. Similarly, it provides local URIs for two other public IDs. </p><p>Note that the document above includes a DOCTYPE – this may cause the parser to attempt to access the system ID URL for the DOCTYPE (i.e. <code><a rel="nofollow" class="external free" href="http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd</a></code>) before the catalog resolver is fully functioning, which is probably undesirable. To prevent this, simply remove the DOCTYPE declaration. </p><p>The following example shows this, and also shows the equivalent <code><system/></code> declarations as an alternative to <code><public/></code> declarations. </p> <div class="mw-highlight mw-highlight-lang-xml mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="cp"><?xml version="1.0"?></span> <span class="w"> </span><span class="nt"><catalog</span><span class="w"> </span><span class="na">xmlns=</span><span class="s">"urn:oasis:names:tc:entity:xmlns:xml:catalog"</span><span class="nt">></span> <span class="w"> </span><span class="nt"><system</span><span class="w"> </span><span class="na">systemId=</span><span class="s">"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml1/xhtml1-strict.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"><system</span><span class="w"> </span><span class="na">systemId=</span><span class="s">"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml1/xhtml1-transitional.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"><system</span><span class="w"> </span><span class="na">systemId=</span><span class="s">"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"</span> <span class="w"> </span><span class="na">uri=</span><span class="s">"dtd/xhtml11/xhtml11-flat.dtd"</span><span class="nt">/></span> <span class="w"> </span><span class="nt"></catalog></span> </pre></div> <div class="mw-heading mw-heading2"><h2 id="Using_a_catalog_–_Java_SAX_example"><span id="Using_a_catalog_.E2.80.93_Java_SAX_example"></span>Using a catalog – Java SAX example</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=XML_catalog&action=edit&section=2" title="Edit section: Using a catalog – Java SAX example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Catalog resolvers are available for various programming languages. The following example shows how, in Java, a <a href="/wiki/Simple_API_for_XML" title="Simple API for XML">SAX</a> parser may be created to parse some input source in which the <code>org.apache.xml.resolver.tools.CatalogResolver</code> is used to resolve external entities to locally cached instances. This resolver originates from <a href="/wiki/Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache</a> <a href="/wiki/Apache_Xerces" title="Apache Xerces">Xerces</a> but is now included with the Sun Java runtime. </p><p>It is necessary to create a <code>SAXParser</code> in the standard way by using factories. The XML reader entity resolver should be set to the default or to a customly-made one. </p> <div class="mw-highlight mw-highlight-lang-java mw-content-ltr" dir="ltr"><pre><span></span><span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">SAXParser</span><span class="w"> </span><span class="n">saxParser</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SAXParserFactory</span><span class="p">.</span><span class="na">newInstance</span><span class="p">().</span><span class="na">newSAXParser</span><span class="p">();</span> <span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">XMLReader</span><span class="w"> </span><span class="n">reader</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">saxParser</span><span class="p">.</span><span class="na">getXMLReader</span><span class="p">();</span> <span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">ContentHandler</span><span class="w"> </span><span class="n">handler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">...;</span> <span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">InputSource</span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">...;</span> <span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">setEntityResolver</span><span class="p">(</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CatalogResolver</span><span class="p">()</span><span class="w"> </span><span class="p">);</span> <span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">setContentHandler</span><span class="p">(</span><span class="w"> </span><span class="n">handler</span><span class="w"> </span><span class="p">);</span> <span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">parse</span><span class="p">(</span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="p">);</span> </pre></div> <p>It is important to call the <code>parse</code> method on the reader, <i>not</i> on the SAX parser. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=XML_catalog&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFWalsh2005" class="citation web cs1">Walsh, Norman (7 October 2005). <a rel="nofollow" class="external text" href="http://www.oasis-open.org/committees/download.php/14810/xml-catalogs.pdf">"XML Catalogs OASIS Standard V1.1"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/OASIS_(organization)" title="OASIS (organization)">OASIS</a></i> (pdf)<span class="reference-accessdate">. Retrieved <span class="nowrap">4 November</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=OASIS&rft.atitle=XML+Catalogs+OASIS+Standard+V1.1&rft.date=2005-10-07&rft.aulast=Walsh&rft.aufirst=Norman&rft_id=http%3A%2F%2Fwww.oasis-open.org%2Fcommittees%2Fdownload.php%2F14810%2Fxml-catalogs.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AXML+catalog" class="Z3988"></span></span> </li> </ol></div></div> <ul><li><a rel="nofollow" class="external text" href="http://www.oasis-open.org/committees/download.php/14810/xml-catalogs.pdf">XML Catalogs. OASIS Standard, Version 1.1. 7 October 2005.</a></li> <li><a rel="nofollow" class="external text" href="http://java.sun.com/webservices/docs/1.6/jaxb/catalog.html">XML Entity and URI Resolvers</a>, Sun</li> <li><a rel="nofollow" class="external text" href="http://xmlcatmgr.sourceforge.net/">XML Catalog Manager</a> project on SourceForge</li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=XML_catalog&oldid=1208354199">https://en.wikipedia.org/w/index.php?title=XML_catalog&oldid=1208354199</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:XML" title="Category:XML">XML</a></li><li><a href="/wiki/Category:Computer_file_formats" title="Category:Computer file formats">Computer file formats</a></li><li><a href="/wiki/Category:Markup_languages" title="Category:Markup languages">Markup languages</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Use_dmy_dates_from_January_2023" title="Category:Use dmy dates from January 2023">Use dmy dates from January 2023</a></li><li><a href="/wiki/Category:Articles_needing_cleanup_from_March_2018" title="Category:Articles needing cleanup from March 2018">Articles needing cleanup from March 2018</a></li><li><a href="/wiki/Category:All_pages_needing_cleanup" title="Category:All pages needing cleanup">All pages needing cleanup</a></li><li><a href="/wiki/Category:Articles_containing_how-to_sections" title="Category:Articles containing how-to sections">Articles containing how-to sections</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_November_2023" title="Category:Articles needing additional references from November 2023">Articles needing additional references from November 2023</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li><li><a href="/wiki/Category:Articles_with_multiple_maintenance_issues" title="Category:Articles with multiple maintenance issues">Articles with multiple maintenance issues</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 17 February 2024, at 05:24<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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