[xsl] Checking for existence of a string within node-set

[Manny Parasirakis <mannyp@xxxxxxx>]

Does anyone know of any way to check for the existence of a string within 
an attribute inside a node within a node-set? I am trying to transform an 
XML file by only selecting the tags whose name attribute matches the name 
attribute in another xml file's tag. Example:

xml1.xml

<AAA>
   <BBB name="xxx">
      <CCC>...</CCC>
   </BBB>
   <BBB name="yyy">
      <CCC>...</CCC>
   </BBB>
   <BBB name="zzz">
      <CCC>...</CCC>
   </BBB>
</AAA>

xml2.xml

<MMM>
   <NNN>
      <OOO name="xxx" mode="1"/>
      <OOO name="yyy" mode="2"/>
      <OOO name="zzz" mode="3"/>
   </NNN>
</MMM>

I am transforming xml1.xml using information within the attributes in 
xml2.xml. I would like the output to look like this:

<AAA>
   <BBB name="yyy">
      <CCC>...</CCC>
      <DDD>...</DDD>   <--- This would be added by the transform
      <EEE>...</EEE>   <--- This would be added by the transform
   </BBB>
   <BBB name="zzz">
      <CCC>...</CCC>
      <DDD>...</DDD>   <--- This would be added by the transform
      <EEE>...</EEE>   <--- This would be added by the transform
   </BBB>
</AAA>

Basically what is happening is that the BBB tag would only be included if 
its name attribute exists in xml2.xml within the OOO name attribute and the 
mode attribute is 1 or 2. In addition, during the transform I would like to 
add the DDD and EEE tags within each BBB tag.

I tried using xsl:foreach within another xsl:foreach to iterate through 
each name attribute within xml2.xml and then using an xsl:if to check if 
the strings match. Within the if I use an xsl:copy which adds the DDD and 
EEE tag but then closes the BBB tag and writes the CCC tag outside of the BBB.


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