plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="dita-ot/plugin.rnc" type="application/relax-ng-compact-syntax"?>
<plugin id="fox.jason.extend.css" version="1.3.0">
	<feature extension="ant.import" file="process_css_extend.xml"/>
	<!-- HTML5 extension points -->   
	<feature extension="dita.xsl.html5" value="xsl/xhtml.xsl" type="file"/>
	<!-- XHTML extension points -->
	<feature extension="dita.xsl.xhtml" value="xsl/xhtml.xsl" type="file"/>
	<!-- Uses the default depend.preprocess.post extension point -->
	<feature extension="depend.preprocess.post" value="extend.css"/>
	<!-- Offers three additional extension points for dependent plug-ins -->
	<extension-point id="extend.css.process.pre" name="Custom CSS pre-processing"/>
	<extension-point id="extend.css.process" name="Custom CSS processing"/>
	<extension-point
    id="extend.css.process.post"
    name="Custom CSS post-processing"
  />
	<!-- Add a template file to enable overrides to use extension points -->
	<template file="process_css_extend_template.xml"/>
</plugin>