Recipe 14.6. Java Extension Function Using the Java Format Namespace
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xalan="http://xml.apache.org/xslt"
xmlns:java="http://xml.apache.org/xslt/java">
<xalan:component prefix="Math" functions="sin cos tan atan">
<xalan:script lang="javaclass" src="http://xml.apache.org/xslt/java"/>
</xalan:component>
<xsl:variable name="pi" select="4.0 * java:java.lang.Math:atan(1.0)"/>
<!-- ... -->
</xsl:stylesheet>
Use this form if you want to access a wide variety of Java-based
extensions with a single namespace declaration. The disadvantage is
that each invocation becomes more verbose.
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