Re: how to group nodes by id?

--- G. Ken Holman  wrote:
> 
> At 2002-12-02 07:48 -0800, Artur Matysiak wrote:
> >  does anybody know how to convert the following XML: 
> 
> Below is a solution using variables and a solution using keys.  Take
> your 
> pick.  Grouping algorithms are documented in the FAQ ... what aspects
> of 
> the documentation did you find confusing?
> 
> I hope this helps.
> 
> ...................... Ken
> 
> T:\ftemp>type artur.xml
> <elems>
>   <elem id="1">
>    <elem id="1"/>
>   </elem>
>   <elem id="1">
>    <elem id="2"/>
>   </elem>
>   <elem id="2">
>    <elem id="1"/>
>   </elem>
>   <elem id="2">
>    <elem id="2"/>
>   </elem>
> </elems>
> 


[solution with xsl:variable skipped]

> T:\ftemp>type artur2.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:key name="elems" match="elem[elem]" use="@id"/>
> 
> <xsl:template match="elems">
>    <elems>
>      <xsl:for-each
> select="elem[generate-id(.)=generate-id(key('elems',@id))]">
>        <xsl:copy>
>          <xsl:copy-of select="@*"/>
>          <xsl:copy-of select="key('elems',@id)/node()"/>
>        </xsl:copy>
>      </xsl:for-each>
>    </elems>
> </xsl:template>
> 
> </xsl:stylesheet>
> 
> T:\ftemp>saxon artur.xml artur2.xsl
> <?xml version="1.0" encoding="utf-8"?>
> <elems>
>     <elem id="1">
> 
>        <elem id="1"/>
> 
> 
>        <elem id="2"/>
> 
>     </elem>
>     <elem id="2">
> 
>        <elem id="1"/>
> 
> 
>        <elem id="2"/>
> 
>     </elem>
> </elems>
> T:\ftemp>
> 
> T:\ftemp>
> 


This solution will work only if the child "element"s have all unique
"id" attributes.

For example, when applied on the following source xml:

<elems> 
  <elem id="1">  
    <elem id="1"/>  
    <elem id="2"/> </elem> 
  <elem id="1">  
    <elem id="2"/> </elem> 
  <elem id="1">  
    <elem id="2"/> </elem> 
  <elem id="1">  
    <elem id="3"/> </elem> 
  <elem id="2">  
    <elem id="1"/> </elem> 
  <elem id="2">  
    <elem id="2"/> </elem> 
</elems>


the result of the transformation is:

<?xml version="1.0" encoding="utf-8"?>
<elems>
   <elem id="1">  
    
      <elem id="1"/>  
    
      <elem id="2"/>   
    
      <elem id="2"/>   
    
      <elem id="2"/>   
    
      <elem id="3"/> 
   </elem>
   <elem id="2">  
    
      <elem id="1"/>   
    
      <elem id="2"/> 
   </elem>
</elems>

Probably I misunderstand the problem, but I think that the
re-structuring had to be accompanied by elimination of elements with
non-unique "id" attributes.





=====
Cheers,

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

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