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/usr/share/xml/xhtml-relaxng/modules/attribs.rng is in xhtml-relaxng 20091111-4ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Common Attributes Module -->
<grammar xmlns="http://relaxng.org/ns/structure/1.0">

<define name="id.attrib">
  <optional>
    <attribute name="id">
      <ref name="ID.datatype"/>
    </attribute>
  </optional>
</define>

<define name="class.attrib">
  <optional>
    <attribute name="class">
      <ref name="NMTOKENS.datatype"/>
    </attribute>
  </optional>
</define>

<define name="title.attrib">
  <optional>
    <attribute name="title">
      <ref name="Text.datatype"/>
    </attribute>
  </optional>
</define>

<define name="Core.attrib">
  <ref name="id.attrib"/>
  <ref name="class.attrib"/>
  <ref name="title.attrib"/>
</define>

<define name="lang.attrib">
  <optional>
    <attribute name="xml:lang">
      <ref name="LanguageCode.datatype"/>
    </attribute>
  </optional>
</define>

<define name="I18n.attrib">
  <ref name="lang.attrib"/>
</define>

<define name="Common.attrib">
  <ref name="Core.attrib"/>
  <ref name="I18n.attrib"/>
</define>

<define name="CommonIdRequired.attrib">
  <attribute name="id">
    <ref name="ID.datatype"/>
  </attribute>
  <ref name="class.attrib"/>
  <ref name="title.attrib"/>
  <ref name="I18n.attrib"/>
</define>

</grammar>