Using internationalized indexing in DocBook stylesheets

internationalized indexing must be invoked from customization layer

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

<xsl:import 
  href="http://docbook.sf.net/release/xsl/current/fo/docbook.xsl"/>
<xsl:include
  href="http://docbook.sf.net/release/xsl/current/fo/autoidx-ng.xsl"/>

<!-- Parameter settings and other modifications of stylesheet -->

</xsl:stylesheet>

known to work with: Saxon and Xalan

known not to work with: xsltproc