RE: [xsl] How to filter element values...

Subject: RE: [xsl] How to filter element values...
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 10 Feb 2004 21:12:40 -0500
At 2004-02-10 16:56 -0800, Josh Canfield wrote:
I could be reading it wrong, but I don't think that section covers the behavior that I am seeing.

I believe it is covered by the very first sentence of 5.8, even though there isn't an example of the processing of leaf nodes in a mode.

There cannot be a situation where there is no template anywhere for any mode, so the first sentence implicitly includes processing leaf nodes in a mode.

5.8 starts: "There is a built-in template rule to allow recursive processing to continue in the absence of a successful pattern match by an explicit template rule in the stylesheet." ... therefore if the stylesheet is absent a successful pattern match for a text node in a mode, there must be a built-in template rule. And the built-in template rule for text nodes adds the node to the result tree. I think it is just missing detail to spell that out in the document.

I would expect this stylesheet:

<?xml version="1.0" ?>
<xsl:stylesheet version="1.0"
  xmlns:xsl=""; >
  <xsl:template match="/">
        <xsl:apply-templates mode="MISSING_MODE"/>

to output:


That would require an empty template rule for the text() node .. not an absent template rule. I don't think an absent rule should imply "do nothing", therefore, I think the spec successfully covers the need for processing text() nodes in any mode by adding their content to the result tree.

Both Xalan and Saxon behave as though there is a built-in text and attribute template that is equivalent to:

<xsl:template match="text()|@*" mode="m">
  <xsl:value-of select="."/>

I believe this to be implied by the first sentence, and I have documented it as such since day one in my XSLT training material, and I chose to include in the material an illustration of the template rules for leaf nodes in a mode.

................. Ken

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G. Ken Holman                  mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd. 
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