XML/XSLT stylesheet/element available
element-available("xsl:odorama")
<source lang="xml">
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="6"> <xsl:template match="title"> <xsl:choose> <xsl:when test="element-available("xsl:odorama")"> </xsl:when> <xsl:otherwise> <xsl:message> xsl:odorama element not supported. </xsl:message> </xsl:otherwise> </xsl:choose> Title: <xsl:apply-templates /> </xsl:template> <xsl:template match="chapter/title"> Chapter title: <xsl:apply-templates /> </xsl:template>
</xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>
J A S 1 Drive Vancouver BC 80210 303-4668903 222-222222 303-4667357 j@hotmail.ru </source>