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Re: [xsl] Help describing the behavior of a Path Expression

2019-06-04 15:16:07
did you mean @percentage ge '15'] here?  that is string comparison,
you want 15 if you want a numeric comparison

However to answer the question, the pattern "item" does have a lower
default priority than the pattern "item[anything]"  (strictly speaking
this is an xslt pattern not an xpath)


On Tue, 4 Jun 2019 at 21:06, Bridger Dyson-Smith 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Hi all -

apologies for the awkward title. I was helping a coworker with a problem, 
where we wanted to ignore certain elements that didn't meet certain 
requirements. We had a working template for the elements with requirements, 
but how to make the processor ignore the others? My suggestion was to write 
an empty template for the element (`item` below), with the paraphrased 
explanation: "the processor with ignore the general expression but match on 
the specific expression", but I'm clueless about the "why doesn't the 
processor ignore all of the `item` elements, then?". I have the sense that 
explanation might be approximately right, but it (and I) would benefit from 
an improved understanding of what's actually happening.

Would someone be willing to share some better words to describe this? Is it 
as easy as saying that since $expression-a (`item[discount]`) has a 
predicate, it has a higher precedence than $expression-b (`item`) (or maybe 
more simply: operator precedence - I see a note in Dr. Kay's XSLT/XPath 2.0 
book about this)?

Thanks in advance for your time and trouble.

Here's a contrived example of our source document:
<!-- source -->
  <item color="red" size="m">
  <item color="blue" size="m">
    <discount percentage="20"/>
  <item color="yellow" size="l">
    <discount percentage="10"/>

And a stylesheet:
<!-- xsl -->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  <xsl:output encoding="UTF-8" method="xml" indent="yes"/>
  <xsl:strip-space elements="*"/>

  <!-- identity transform -->
  <xsl:template match="@*|node()">
      <xsl:apply-templates select="@*|node()"/>

  <xsl:template match="item[discount[@percentage ge '15']]">
    <discount-item color="{@color}" size="{@size}" price="{price}" 

  <xsl:template match="item"/>
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