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element-available
XML XSL

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="myFile.xslt"?>

<store>

  <book id="1">
    <title>XML</title>
    <author>Bill</author>
    <price>25.50</price>
  </book>

  <book id="2">
    <title>XSL</title>
    <author>Vijay</author>
    <price>75.60</price>
  </book>

  <book id="3">
    <title>HTML</title>
    <author>Kris</author>
    <price>50.40</price>
  </book>

</store>

<?xml version='1.0'?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="html"/>

  <xsl:template match="/">

    <xsl:choose>
      <xsl:when test="element-available('xsl:if')">
        It is Available and supported by the XSLT
      </xsl:when>
      <xsl:otherwise>
        It is Not Available because it is XSLT non-instruction element
      </xsl:otherwise>
    </xsl:choose>

  </xsl:template>

</xsl:stylesheet>


OutPut:

It is Available and supported by the XSLT