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<html lang="en-us"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="UTF-8"><meta name="copyright" content="(C) Copyright 2019"><meta name="DC.rights.owner" content="(C) Copyright 2019"><meta name="DC.type" content="task"><meta name="description" content="You can override specific XSLT-processing steps in both the pre-processing pipeline and certain DITA-OT transformations."><meta name="DC.subject" content="plug-ins, XSLT, preprocessing, XHTML"><meta name="keywords" content="plug-ins, XSLT, preprocessing, XHTML"><meta name="DC.relation" scheme="URI" content="../topics/plugin-applications.html"><meta name="DC.relation" scheme="URI" content="../extension-points/plugin-extension-points-xslt-import.html"><meta name="DC.relation" scheme="URI" content="../topics/plugins-installing.html"><meta name="DC.format" content="HTML5"><meta name="DC.identifier" content="plugin-overridestyle"><meta name="DC.language" content="en-US"><link rel="stylesheet" type="text/css" href="../css/commonltr.css"><link rel="stylesheet" type="text/css" href="../css/dita-ot-doc.css"><title>Overriding an XSLT-processing step</title></head><body id="plugin-overridestyle"><header role="banner"><div class="header">
  <p>DITA Open Toolkit</p>
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  <h1 class="title topictitle1" id="ariaid-title1">Overriding an XSLT-processing step</h1>
  
  
  <div class="body taskbody"><p class="shortdesc">You can override specific XSLT-processing steps in both the pre-processing pipeline and certain DITA-OT
    transformations.</p>
    <section><div class="tasklabel"><h2 class="sectiontitle tasklabel">Procedure</h2></div><ol class="ol steps"><li class="li step stepexpand">
        <span class="ph cmd">Develop an XSL file that contains the XSL override.</span>
      </li><li class="li step stepexpand">
        <span class="ph cmd">Construct a <span class="ph filepath">plugin.xml</span> file that contains the following content:</span>
        <div class="itemgroup info"><pre class="pre codeblock language-xml normalize-space show-line-numbers show-whitespace"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;plugin id="<var class="keyword varname">plugin-id</var>"&gt;
  &lt;feature extension="<var class="keyword varname">extension-point</var>" file="<var class="keyword varname">relative-path</var>"/&gt;
&lt;/plugin&gt;</code></pre>where:
          <ul class="ul">
            <li class="li"><var class="keyword varname">plugin-id</var> is the plug-in identifier, for example, com.example.brandheader.</li>
            <li class="li"><var class="keyword varname">extension-point</var> is the DITA-OT extension point, for example,<code class="ph codeph">
                dita.xsl.xhtml</code>. This indicates the DITA-OT processing step that the XSL override applies
              to.</li>
            <li class="li"><var class="keyword varname">relative-path</var> is the relative path and name of the XSLT file, for example,
                <span class="ph filepath">xsl/header.xsl</span>. </li>
          </ul></div>
      </li><li class="li step stepexpand">
        <span class="ph cmd">Install the plug-in.</span>
      </li></ol></section>
    <section class="section result"><div class="tasklabel"><h2 class="sectiontitle tasklabel">Results</h2></div>The plug-in installer adds an XSL import statement to the default DITA-OT code, so that the XSL override
      becomes part of the normal build.</section>
    <section class="example"><h2 class="title sectiontitle">Example: Overriding XHTML header processing</h2>
      
      <p class="p">The following two files represent a complete, simple style plug-in.</p>
      <p class="p">The <span class="ph filepath">plugin.xml</span> file declares an XSLT file that extends XHTML processing:</p>
      <pre class="pre codeblock language-xml normalize-space show-line-numbers show-whitespace"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;plugin id="com.example.brandheader"&gt;
  &lt;feature extension="dita.xsl.xhtml" file="xsl/header.xsl"/&gt;
&lt;/plugin&gt;</code></pre>
      <p class="p">The <span class="ph filepath">xsl/header.xsl</span> XSLT file referenced in <span class="ph filepath">plugin.xml</span> overrides the
        default header processing to add a banner:</p>
      <pre class="pre codeblock language-xml normalize-space show-line-numbers show-whitespace"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;xsl:stylesheet version="1.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt;
  &lt;xsl:template name="gen-user-header"&gt;
    &lt;div&gt;&lt;img src="http://www.example.com/company_banner.jpg" 
              alt="Example Company Banner"/&gt;&lt;/div&gt;
  &lt;/xsl:template&gt;
&lt;/xsl:stylesheet&gt;</code></pre>
    </section>
    
  </div>
<nav role="navigation" class="related-links"><div class="familylinks"><div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/plugin-applications.html" title="Plug-ins allow you to extend the functionality of DITA-OT. This might entail adding support for specialized document types, integrating processing overrides, or defining new output transformations.">Plug-in applications</a></div></div><div class="linklist relinfo reltasks"><strong>Related tasks</strong><br><ul class="linklist"><li class="linklist"><a class="link" href="../topics/plugins-installing.html" title="Use the dita command to install a plug-in.">Installing plug-ins</a></li></ul></div><div class="linklist relinfo relref"><strong>Related reference</strong><br><ul class="linklist"><li class="linklist"><a class="link" href="../extension-points/plugin-extension-points-xslt-import.html" title="You can use these extension points to override XSLT processing steps in pre-processing and certain transformation types. The value of the file attribute in the feature element specifies a relative path to an XSL file in the current plug-in. The plug-in installer adds a XSL import statement to the default DITA-OT code, so that the XSL override becomes part of the normal build.">XSLT-import extension points</a></li></ul></div></nav></article></main></body></html>