XSLT, 2nd Edition

Jacl

Jacl is a Tcl (Tool Command Language) interpreter written entirely in Java. We define the namespace prefix jacl-extension and associate it with the URI http://tcljava.sourceforge.net. The code is straightforward:

<?xml version="1.0"?>
<!-- piechart-jacl.xsl -->
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:svg="http://www.w3.org/2000/svg"
  xmlns:months="http://www.oreilly.com/xslt/months"
  xmlns:lxslt="http://xml.apache.org/xslt"
  xmlns:jacl-extension="http://tcljava.sourceforge.net"
  extension-element-prefixes="jacl-extension"
  exclude-result-prefixes="lxslt">
...
  <lxslt:component prefix="jacl-extension" 
    functions="cos sin">
    <lxslt:script lang="jacl">
      proc cos {d}  {expr cos($d)}
      proc sin {d}  {expr sin($d)}
    </lxslt:script>
  </lxslt:component>

To use these extension functions, your CLASSPATH must contain jacl.jar and tcljava.jar, available at http://tcljava.sourceforge.net, in addition to bsf.jar and commons-logging-1.1.jar.