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

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).
...
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.
...
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" />

T:\ftemp>type peter.xml
<invoices>
 <invoiceHeader> ...</invoiceHeader>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine>
 <invoiceHeader>... </invoiceHeader>
 <invoiceLine>... </invoiceLine>
 <invoiceLine>... </invoiceLine>
</invoices>

T:\ftemp>type peter.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

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

</xsl:stylesheet>
T:\ftemp>xslt peter.xml peter.xsl con
<?xml version="1.0" encoding="utf-8"?>
<invoices>
   <invoice>
      <invoiceHeader> ...</invoiceHeader>
      <invoiceLine>... </invoiceLine>
      <invoiceLine>... </invoiceLine>
      <invoiceLine>... </invoiceLine>
   </invoice>
   <invoice>
      <invoiceHeader>... </invoiceHeader>
      <invoiceLine>... </invoiceLine>
      <invoiceLine>... </invoiceLine>
   </invoice>
</invoices>
T:\ftemp>

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