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11.6. <xsl:fallback>: What to do if an extension is missing

If you are trying to use an XSLT extensions (see extension elements, below), and the extension can't be found, you can provide an <xsl:fallback> element to specify what actions should be taken. For example, this fragment shows a reference to an extension element named <exsl:document>. If that element is not available, it writes a message and terminates:

    <exsl:document href="page.html">
      <xsl:fallback>
        <xsl:message terminate="yes">
          Aieeee! The exsl:document package is missing!
          I'm out of here!
        </xsl:message>
      </xsl:fallback>
    </exsl:document>