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

Hi David

On Tue, Jun 4, 2019 at 4:16 PM David Carlisle 
d(_dot_)p(_dot_)carlisle(_at_)gmail(_dot_)com <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

did you mean @percentage ge '15'] here?  that is string comparison,
you want 15 if you want a numeric comparison

Yes :) - sorry for the typos in the example.

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)

Thanks for helping clear that up! I'll roll with that the next time this

topic comes around.

David

Best,

Bridger


On Tue, 4 Jun 2019 at 21:06, Bridger Dyson-Smith 
bdysonsmith(_at_)gmail(_dot_)com
<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.
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}"

discount="{discount/@percentage}"/>

  </xsl:template>

  <xsl:template match="item"/>
</xsl:stylesheet>
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