Re: Matching a first instance.

This transformation:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:myIDs="my:Ids"
 exclude-result-prefixes="myIDs">

 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*" />

 <myIDs:myIDs>
   <id>personal</id>
   <id>handheld</id>
 </myIDs:myIDs>

 <xsl:variable name="vIDs" select="document('')/*/myIDs:*/*"/>

  <xsl:template match="@* | node()" name="ident">
    <xsl:copy>
      <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="TestElement[@xmlid='testID']/*">
    <xsl:choose>
    <xsl:when test="@xmlid = $vIDs
                and
                  not(preceding-sibling::*[@xmlid = $vIDs])">
      <xsl:copy>
        <xsl:copy-of select="@*"/>
        <xsl:attribute name="cost">0</xsl:attribute>
      </xsl:copy>
    </xsl:when>
    <xsl:otherwise>
      <xsl:call-template name="ident"/>
    </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

</xsl:stylesheet>

when applied on your source.xml:

<t>
  <TestElement xmlid="testID">
    <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The
Set We Care About" />
    <adder xmlid="handheld" cost="2" alias="handheld computers" />
    <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The
Set We Care About" />
    <adder xmlid="personal" cost="2" alias="personal computers" />
  </TestElement>
  <TestElement xmlid="testID">
    <adder xmlid="personal" cost="2" alias="personal computers" />
    <adder xmlid="handheld" cost="2" alias="handheld computers" />
    <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The
Set We Care About" />
  </TestElement>
</t>

produces the wanted result:

<t>
   <TestElement xmlid="testID">
      <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The  Set We Care About"/>
      <adder xmlid="handheld" cost="0" alias="handheld computers"/>
      <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The  Set We Care About"/>
      <adder xmlid="personal" cost="2" alias="personal computers"/>
   </TestElement>
   <TestElement xmlid="testID">
      <adder xmlid="personal" cost="0" alias="personal computers"/>
      <adder xmlid="handheld" cost="2" alias="handheld computers"/>
      <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In
The  Set We Care About"/>
   </TestElement>
</t>

Please, also note that according to the XML spec names starting with "xml"
are reserved and are not recommended to be used.



=====
Cheers,

Dimitre Novatchev.
http://fxsl.sourceforge.net/ -- the home of FXSL

"Ben Trafford" <ben@xxxxxxxxxxx> wrote in message
news:5.2.0.9.2.20031128205856.037d3168@xxxxxxxxxxxxxxxxxxxx
>
> Hi!
>
> I have a somewhat unusual problem. I want to match an xsl:if test to the
> first occurrence of an element with an attribute of a particular value. An
> example snippet of XML to be transformed:
>
> <TestElement xmlid="testID">
> <adder xmlid="personal" cost="2" alias="personal computers" />
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> <adder xmlid="network" cost="2" alias="networked computers" />
> <adder xmlid="mainframe" cost="2" alias="mainframe" />
> </TestElement>
>
> The test needs to find all the TestElements whose xmlid is
> 'testID''.  Then find the first child element whose xmlid matches any of
> those listed. Then change that child element's "cost" attribute to "0".
> Leave the other "cost" attributes alone.
>
> So, the above snippet would be changed to:
>
> <TestElement xmlid="testID">
> <adder xmlid="personal" cost="0" alias="personal computers" />
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> <adder xmlid="network" cost="2" alias="networked computers" />
> <adder xmlid="mainframe" cost="2" alias="mainframe" />
> </TestElement>
>
> The following snippet:
>
> <TestElement xmlid="testID">
> <adder xmlid="Not_In_The_Set_To_Be_Recognized"
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> </TestElement>
>
>   would be changed to:
>
> <TestElement xmlid="testID">
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> <adder xmlid="handheld" cost="0" alias="handheld computers" />
> </TestElement>
>
> And the following:
>
> <TestElement xmlid="testID">
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> <adder xmlid="personal" cost="2" alias="personal computers" />
> </TestElement>
> <TestElement xmlid="testID">
> <adder xmlid="personal" cost="2" alias="personal computers" />
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> </TestElement>
>
> would become:
>
> <TestElement xmlid="testID">
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> <adder xmlid="handheld" cost="0" alias="handheld computers" />
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> <adder xmlid="personal" cost="2" alias="personal computers" />
> </TestElement>
> <TestElement xmlid="testID">
> <adder xmlid="personal" cost="0" alias="personal computers" />
> <adder xmlid="handheld" cost="2" alias="handheld computers" />
> <adder xmlid="Not_In_The_Set_To_Be_Recognized" cost="1" alias="Not In The
> Set We Care About" />
> </TestElement>
>
> Any help would be much appreciated. Note that the "xmlid" attributes being
> used are -not- unique. They will re-occur.
>
> --->Ben
>
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
>
>




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