Re: How can you tell if a variable exists?
> > How can you tell if a variable exists (or rather does not > > exist), without erroring out of the stylesheet. > > > Referring to $v when there is no <xsl:param name="v"> or <xsl:variable > name="v"> in scope is an error, and you can't trap this. But referring to $v > when there is a declaration of <xsl:param name="v"> should not give an > exception, whether or not the parameter has been given a value. > > From the description of your problem, I would declare a global parameter > > <xsl:param name="v"/> > > and then in your code you can do > > <xsl:choose> > <xsl:when test="not($v)"> <!-- parameter has not been supplied --> > </xsl:when> > <xsl:otherwise> <!--parameter has been supplied --> </xsl:otherwise> > </xsl:choose> > > The reason this works is that when no actual parameter v is supplied, it > takes its default value, which in this case is an empty string (because the > xsl:param has no select expression or content), and the test not($v) returns > true if $v is an empty string. That works SWEET. Thanks a lot. Scott XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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