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Re: Help describing the behavior of a Path Expression

Subject: Re: Help describing the behavior of a Path Expression
From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 4 Jun 2019 20:16:03 -0000
Re:  Help describing the behavior of a Path Expression
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 bdysonsmith@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> 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
> Thanks in advance for your time and trouble.
> Best,
> Bridger
> Here's a contrived example of our source document:
> <!-- source -->
> <items>
>   <item color="red" size="m">
>     <price>15.00</price>
>   </item>
>   <item color="blue" size="m">
>     <price>15.00</price>
>     <discount percentage="20"/>
>   </item>
>   <item color="yellow" size="l">
>     <price>15.00</price>
>     <discount percentage="10"/>
>   </item>
> </items>
> And a stylesheet:
> <!-- xsl -->
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>   xmlns:xs="http://www.w3.org/2001/XMLSchema"
>   exclude-result-prefixes="xs"
>   version="2.0">
>   <xsl:output encoding="UTF-8" method="xml" indent="yes"/>
>   <xsl:strip-space elements="*"/>
>   <!-- identity transform -->
>   <xsl:template match="@*|node()">
>     <xsl:copy>
>       <xsl:apply-templates select="@*|node()"/>
>     </xsl:copy>
>   </xsl:template>
>   <xsl:template match="item[discount[@percentage ge '15']]">
>     <discount-item color="{@color}" size="{@size}" price="{price}"
>   </xsl:template>
>   <xsl:template match="item"/>
> </xsl:stylesheet>
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