Re: xslt2 grouping

 <el x='2' y='3'/> and
 <el x='2' y='4'/> 
  are they classed as duplicate members
  of this population?

No, even if they the same y attribute.

  A set of sequences.
  A set.
  But a set does not contain duplicates?

I suspect me droning on about set theory has made you paranoid.
You are partitioning the original sequence so every item has a
distinguishing property (its position in the original sequence)
so there are no duplicates.

David
(I think)


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