Re: [xsl] XML/XSLT Problem

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2002-07-29 15:30 -0400, Alex Genis wrote:
> I have input XML Document like this:
> ...
> I need to create XSLT Stylesheet which retrieves from this XML only those
> elements "PP", "IP" and "PR" where:
> (PP/IPI/@id = IP/@id) and (IP/@id-1 = PR/@id).
> ...
> If beeing already within <xsl:template match="abc">
> I use <xsl:apply-templates select="PP|IP|PR"> - I can not refer to the
> attributes of this elements ("id" and "id-1") because this attribute names
> are not unique.

I'm not sure what you are saying in the last sentence I quoted above.

> Can somebody give me a hint  how can I solve this problem?

Attached below is a stylesheet that matches the limited data example you 
have, and I think it expresses what you want from your English 
description.  The IP element is what is common between the IPI element and 
the PR element, so I used that as the focus of the stylesheet.  My use of 
variables is to improve speed by reducing the accesses to the source node tree.

The key to the solution is the node-set comparison in XSLT will check each 
node in a node-set in a single test.

I hope this helps.

................. Ken


T:\ftemp>type alex.xml
   <ABC>
  <efg>fgh</efg>
  <hij>sdf</hij>
  <abc>
    <PP id="111" id-1="222" >
      <IPI id="333" id-2="444" >
       <p1>p1p1p1</p1>
      </IPI>
      <IPI id="sss" id-2="666" >
       <p1>p2p2p2</p1>
      </IPI>
    </PP>
    <PP id="777" id-1="888" >
      <IPI id="123" id-2="234" >
       <p1>p3p3p3</p1>
      </IPI>
      <IPI id="456" id-2="567" >
       <p1>p4p4p4</p1>
      </IPI>
    </PP>
    <IP id="rrr" id-1="aaa">
      <i1>i1i1i1</i1>
    </IP>
    <IP id="sss" id-1="bbb">
      <i1>i2i2i2</i1>
    </IP>
    <IP id="ttt" id-1="ccc">
      <i1>i3i3i3</i1>
    </IP>
    <IP id="uuu" id-1="ddd">
      <i1>i4i4i4</i1>
    </IP>
    <PR id="xxx">
      <r1>r1r1r1</r1>
    </PR>
    <PR id="bbb">
      <r1>r2r2r2</r1>
    </PR>
    <PR id="zzz">
      <r1>r3r3r3</r1>
    </PR>
  </abc>
</ABC>


T:\ftemp>type alex.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output indent="yes"/>

<xsl:template match="/ABC">
  <xsl:apply-templates select="abc"/>
</xsl:template>

<xsl:template match="abc">
  <abc>
    <xsl:variable name="IPI-ids" select="PP/IPI/@id"/>
    <xsl:variable name="PR-ids" select="PR/@id"/>
    <xsl:variable name="common-IPs" select="IP[@id=$IPI-ids and
                                               @id-1=$PR-ids]"/>

    <xsl:copy-of select="PP[IPI/@id=$common-IPs/@id]"/>
    <xsl:copy-of select="$common-IPs"/>
    <xsl:copy-of select="PR[@id=$common-IPs/@id-1]"/>

  </abc>
</xsl:template>

</xsl:stylesheet>

T:\ftemp>xt alex.xml alex.xsl alex.out

T:\ftemp>type alex.out
<?xml version="1.0" encoding="utf-8"?>
<abc>
<PP id="111" id-1="222">
      <IPI id="333" id-2="444">
       <p1>p1p1p1</p1>
      </IPI>
      <IPI id="sss" id-2="666">
       <p1>p2p2p2</p1>
      </IPI>
    </PP>
<IP id="sss" id-1="bbb">
      <i1>i2i2i2</i1>
    </IP>
<PR id="bbb">
      <r1>r2r2r2</r1>
    </PR>
</abc>

T:\ftemp>rem Done!


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