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Re: XPath equivalence question

Subject: Re: XPath equivalence question
From: Hermann Stamm-Wilbrandt <STAMMW@xxxxxxxxxx>
Date: Thu, 1 Dec 2011 10:43:20 +0100
Re:  XPath equivalence question
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
$ cat Graydon.1.xsl
<xsl:stylesheet version="1.0"
  <xsl:output method="xml"/>

  <xsl:template match="/">
    <xsl:copy-of select="/A//B"/>

$ cat Graydon.2.xsl
<xsl:stylesheet version="1.0"
  <xsl:output method="xml"/>

  <xsl:template match="/">
    <xsl:copy-of select="B[/A]"/>


Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Level 3 support for XML Compiler team, Fixpack team lead
WebSphere DataPower SOA Appliances
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>                                                                                                       


<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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