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<xsl:message> - XSLT | MDN
The <xsl:message> element outputs a message (to the JavaScript Console in NS) and optionally terminates execution of the stylesheet. It can be useful for debugging.
<xsl:message terminate="yes" | "no" >
TEMPLATE
</xsl:message>
terminate
Set to yes, indicates that execution should be terminated. The default value is no, in which case the message is output and execution continues.
Instruction, appears within a template.
