How to generate a failure at runtime in an xslt?

I need to generate a runtime error in an xslt. How to do so?

The following xpaths do not generate runtime errors:

• "1 div 0"
• "/*/*[1 div 0]"
• "/*/*[0]"
• "/*/*[NaN]"

It does not have to be done using xpath, could be done using some xslt construct.

The reason I want this is to effectively have a "NotImple开发者_运维知识库mentedException" in my xslt. There is a specific path that will not be used any time soon, so I do not want to implement it yet.

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You can terminate an XSL script and deliver a message using the xsl:message element.

<xsl:message terminate="yes">
  NotImplementedException
</xsl:message>

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In addidtion to <xsl:message> in XSLT 2.x one can use the standard XPath 2.0 function error().