[xsl] Problem to compare a value with a set of tag content

[Xavier DAMAY <xsl.list@xxxxxxxxxxxxxxx>]

 hello,

i've encountered a problem i can't resolve.
i've got a set of  tags like this
<compte>
   <pdf>1</pdf>
   <pdf>4</pdf>
   ...
</compte>
<annonce>
   <id ="1">
       bla bla
   </id>
   <id ="3">
       bla bla
   </id>

</annonce>

So, with this structure i would like to scan my "ids" and set a variable 
"en-pdf"  to true if the "id"  is in the pdf value : i will set my 
variable to true only for for the id = "1"
I thougth it was possible with nested for-eachs but it doesn't work.

Question 1 : Are nested for-each statements allowed ?
Question 2 :
           <xsl:for-each select="annonce">
               <xsl:variable name="en-pdf">
                   <xsl:for-each select="compte/pdf">
                       <xsl:if test="@id=??????">True</xsl:if> 
                   </xsl:for-each>
               </xsl:variable>

               i want to use the value of my variable $en-pdf.

           </xsl:for-each>
          
           does this block what i want to do ?

           is there a better way to make this ?

           Thank you for all

Xavier





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