RE: [xsl] How to create a node set that excludes some descendant elements?

["Aron Bock" <aronbock@xxxxxxxxxxx>]

Rush, hopefully you'll find better answers, but here's my first pass.  I 
modified the "identity transform" to filter out z and non-first y's.  You'll 
have to tweak it to account for "contained within 'c'".  You may wrap up in 
a variable as needed.

Also, I assume when you mean to discard <z> elements, you also mean to 
discard any of its descendents.


<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0">
   <xsl:output method="xml"/>

   <xsl:template match="node(  ) | @*">
     <xsl:if test="name() != 'z' and not (name() = 'y' and preceding::y)">
         <xsl:copy>
           <xsl:apply-templates select="@* | node(  )"/>
         </xsl:copy>
     </xsl:if>
   </xsl:template>

</xsl:stylesheet>

Regards,

--A


> From: Rush Manbert <rush@xxxxxxxxxxx>
> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] How to create a node set that excludes some descendant 
> elements?
> Date: Mon, 11 Apr 2005 16:57:24 -0700
>
> Hi all,
>
> My first post here and I want to start by saying how much I appreciate the 
> big FAQ, the Jeni site, etc. It has all helped me tremendously.
>
> I can't find an answer to this one, though, so here goes...
>
> My XML doc has this basic structure:
> <a>
>  <b>
>    <c>
>      <!-- This is the section of interest -->
>    </c>
>  </b>
> </a>
>
> The <c> element can contain any combination of elements <d> through <z>. 
> Elements <y> and <z> have special uses.
>
> I want to create a global variable that contains the result tree fragment 
> contained within element <c>, with the following restrictions:
> I only want to include the first <y> element that is contained within <c>, 
> no matter where it occurs. There may be no <y> elements present.
> I want to exclude all <z> elements that are contained within <c>, no matter 
> where they occur. Again, there may be none present.
>
> Later on in my stylesheet, I use exslt:node-set() on the variable and 
> process the node set.
>
> For instance, given this source:
> <a><b><c>
>  <d>
>    <z>
>    <g />
>  </d>
>  <q>
>    <r>
>      <y />
>      <z />
>    </r>
>    <y />
>  <q>
>  <y>
> </c></b></a>
>
> I want the selection to contain this:
> <a><b><c>
>  <d>
>    <g />
>  </d>
>  <q>
>    <r>
>      <y />
>    </r>
>  <q>
> </c></b></a>
>
> (<z> elements are gone, only the first <y> element remains.)
>
> I have tried many variations on the select portion of the variable 
> definition. I can filter the immediate children of <c>, OR the second level 
> children, etc., but I can't seem to come up with anything that handles <y> 
> and <z> appearing at any depth in the descendant tree.
>
> I'm prepared to be humiliated by some obvious solution... Can anyone please 
> help?
>
> Thanks,
> Rush

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