External Function Calls From Style Sheets

I am looking for some examples of using XSLT style sheets that makes
a call to an external function to perform part of its transformation.

The only thing I have to go on so far is this incomplete snippit:

<?xml version="1.0"?> 
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
  <xsl:template match="doc">
  <xsl:element name="doc">
    <out><xsl:value-of select="java::GetInfo('string(@id)')"/></out>
  </xsl:element>
  </xsl:template>
</xsl:stylesheet>


What I am trying to determin is the proper syntax for the line:

<out><xsl:value-of select="java::ValidateCite('string(@id)')"/></out>

where the "select" is calling a external java or c++ method to perform 
a given task and return some results that will be put between the <out> tags.



 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list