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      <h1>Saxon extensions to XML Schema 1.1</h1>
      <p>The Working Draft XSD 1.1 specification allows implementations to define their own primitive types and facets.</p>
      <p>At present Saxon provides one additional facet, <code>saxon:preprocess</code></p>
      <p>Saxon extensions to the XML Schema Language are implemented in the Saxon namespace <code>http://saxon.sf.net/</code>:</p>
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            <p><a class="bodylink" href="extensions11/saxon.message.xml">Messages associated with assertions and other facets</a></p>
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            <p><a class="bodylink" href="extensions11/preprocess.xml">The saxon:preprocess facet</a></p>
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            <p><a class="bodylink" href="extensions11/extended-uniqueness-constraints.xml">Saxon extensions to XSD uniqueness and referential constraints</a></p>
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               <p align="right"><a class="nav" href="extensions11/saxon.message.xml">Next</a></p>
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