xslt function

fn.xsl

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:fn="http://exslt.org/functions"
	xmlns:my="http://example.com"
	exclude-result-prefixes="fn my">

<xsl:output method="xml"/>

<fn:function name="my:test">
	<fn:result select="'result123'"/>
</fn:function>

<xsl:template match="/">
	<p>
		<p><xsl:value-of select="my:test()"/></p>
	</p>
</xsl:template>

</xsl:stylesheet>