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Re: XPath equivalence question

Subject: Re: XPath equivalence question
From: Michel Hendriksen <michel.hendriksen@xxxxx>
Date: Thu, 1 Dec 2011 10:50:25 +0100
Re:  XPath equivalence question
Just to be curieus doesn't

<xsl:template match="B[/A]">

mean match a B when there is an A underneath the root, not necessarily
the parent of B?

Michel

On Thu, Dec 1, 2011 at 10:43 AM, Hermann Stamm-Wilbrandt
<STAMMW@xxxxxxxxxx> wrote:
> Have you tried out what you propose as equivalent below?
>
> No XSLT processor is doing what you say, xsltproc, saxon, DataPower, ...
>
> $ saxon Graydon.1.xsl Graydon.xml ; echo
> <?xml version="1.0" encoding="UTF-8"?><B/>
> $
> $ saxon Graydon.2.xsl Graydon.xml ; echo
> <?xml version="1.0" encoding="UTF-8"?>
> $
> $ cat Graydon.xml
> <A><a><b><c><B/></c></b></a></A>
> $
> $ cat Graydon.1.xsl
> <xsl:stylesheet version="1.0"
>  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>>
>  <xsl:output method="xml"/>
>
>  <xsl:template match="/">
>    <xsl:copy-of select="/A//B"/>
>  </xsl:template>
>
> </xsl:stylesheet>
> $
> $ cat Graydon.2.xsl
> <xsl:stylesheet version="1.0"
>  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>>
>  <xsl:output method="xml"/>
>
>  <xsl:template match="/">
>    <xsl:copy-of select="B[/A]"/>
>  </xsl:template>
>
> </xsl:stylesheet>
> $
>
>
> Mit besten Gruessen / Best wishes,
>
> Hermann Stamm-Wilbrandt
> Level 3 support for XML Compiler team, Fixpack team lead
> WebSphere DataPower SOA Appliances
> https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
> ----------------------------------------------------------------------
> IBM Deutschland Research & Development GmbH
> Vorsitzender des Aufsichtsrats: Martin Jetter
> Geschaeftsfuehrung: Dirk Wittkopp
> Sitz der Gesellschaft: Boeblingen
> Registergericht: Amtsgericht Stuttgart, HRB 243294
>
>
>
>  From:       Graydon <graydon@xxxxxxxxx>
>
>  To:         xsl-list@xxxxxxxxxxxxxxxxxxxxxx,
>
>  Date:       12/01/2011 12:50 AM
>
>  Subject:     XPath equivalence question
>
>  Sent by:    <graydon@xxxxxxxxx>
>
>
>
>
>
>
> Does
>
> <xsl:template match="/A//B">
>
> match exactly the same thing as
>
> <xsl:template match="B[/A]">?
>
> My presumption is that the second form is preferable on efficiency
> grounds -- on simple table lookup versus whatever tree-structure the
> descendant axis search produces -- but I don't actually know.
>
> -- Graydon

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