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      <h1>Writing a URI Resolver for Input Files</h1>
      <p>Saxon allows you to write your own <code>URIResolver</code> to handle the URIs of input documents, as
defined in the JAXP specification. Such a <code>URIResolver</code> is used to process the URIs supplied to the
<code>doc()</code> and <code>document()</code> functions. It is also used to process the URIs supplied for the
source document and the stylesheet on the command line. In XSLT it is used to process the URIs used
in the <code>xsl:include</code> and <code>xsl:import</code> and <code>xsl:import-schema</code> declarations, 
and in XQuery it supports the location URIs in <code>import schema</code>.</p>
      <p>The <code>URIResolver</code> is called to process
the supplied URI, and it returns a JAXP <code>Source</code> object, which Saxon uses as the source of
the input. Note that the <code>Source</code> must be one of the implementations of <code>Source</code> that Saxon
recognizes: you cannot write your own implementations of the JAXP <code>Source</code> class.</p>
      <p>The <code>URIResolver</code> is used only for XML files. It is therefore not used to support the 
<code>unparsed-text()</code> function in XSLT, or to support <code>import module</code> in XQuery.</p>
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