Simple list -> Nested list based on attribute values

I have an XML document of the form
 
<doc>
  <item header='true'>Section 1</item> 
  <item>Section 1.1</item> 
  <item>Section 1.2</item>
 
  <item header='true'>Section 2</item> 
  <item>Section 2.1</item> 
  <item>Section 2.2</item>
</doc>
 
that I want to transform to the following:
 
<doc>
  <section title="Section 1">
    <item>Section 1.1</item> 
    <item>Section 1.2</item>
  </section>
 
  <section title="Section 2">
    <item>Section 2.1</item> 
    <item>Section 2.2</item>
  </section>
</doc>
 
I was able to match the @header <item>s with the rule 'item[(_at_)header =
"true"]' but couldn't work out a predicate to match "all subsequent
<item>s up until the next @header <item>".
 
Jason
 


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A-03-03-E