[xsl] Positional Grouping problem

I have read the FAQ and think I have found a partial answer to my
problem.  Seems to be Positional Grouping solution (10)
http://www.dpawson.co.uk/xsl/sect2/N4486.html

but my xslt skills are too weak to understand the solution!.  I can't
even get the solution to work - been at this for hours now... very bad I
know.


I have the following XML  - a Batch of Invoices  a 3 line Invoice and a
2 line Invoice (there are a bunch of other tags and data inside these
but for simplicity I've left then out in this example).

 

<invoices>
 <invoiceHeader> ...</invoiceHeader>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine>
 <invoiceHeader>... </invoiceHeader>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine> 
</invoices>


What I need is a <invoice> tag that surrounds the Header and Lines.
There is nothing that relates a Header to a Line apart from its position
i.e the header will be followed by its lines.

<invoices>
 <invoice>
   <invoiceHeader> ...</invoiceHeader>
   <invoiceLine>... </invoiceLine>
   <invoiceLine>... </invoiceLine>
   <invoiceLine>... </invoiceLine>
 </invoice>
 <invoice>
   <invoiceHeader>... </invoiceHeader>
   <invoiceLine>... </invoiceLine>
   <invoiceLine>... </invoiceLine> 
 <invoice>
</invoices>


How can I do this ?

Something like the partial example snippet given in the FAQ above would
give the following - but can somebody fill in the blanks  - I am missing
the start template statements etc - but I do not know what they are
meant to be.

   <xsl:for-each select=="invoiceHeader">

         <invoice>
            <invoiceHeader><xsl:value-of select="." />
            </invoiceHeader>

            <invoiceLine>
               <xsl:for-each select=="following-sibling::invoiceLine[
count(preceding-sibling::invoiceHeader[1] | current()) == 1]">
               <xsl:value-of select=="invoiceLine" />
               </xsl:for-each>
            </invoiceLine>
         </invoice>

    </xsl:for-each>

 

Thanks for any assistance

Peter 

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