XML/XSLT stylesheet/element available

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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
   
   
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     Vancouver
     BC
     80210
   
   
     303-4668903
     222-222222
     303-4667357
   
   j@hotmail.ru
 
</source>