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RE: parameter use in XPath

Subject: RE: parameter use in XPath
From: "Michael Kay" <mhk@xxxxxxxxx>
Date: Fri, 24 Oct 2003 17:55:02 +0100
RE:  parameter use in XPath
> Are you stating that "*[name()=$keyword]" worked for me as 
> the value of a match attribute of xsl:template, using 
> libxslt, quite literally "by accident" (i.e., because the 
> processor doesn't check this constraint)? If so, are there 
> any side effects which may manifest as bugs elsewhere in the 
> stylesheet by taking this terse approach? Do you recommend 
> abandoning this approach?

There are several 1.0 processors that don't enforce this constraint. The
constraint is there in the spec because of a misguided attempt to
prevent circularities such as

<xsl:variable name="x">
  <xsl:apply-templates match="/*/item[1]"/>

<xsl:template match="item[$x]">

Like the restriction on using RTFs as node-sets, it's totally
unnecessary but conformant processors are required to enforce it.

Michael Kay

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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