The value of group-starting-with is a pattern that must match a node in the
population.

Ah, yes ... of course ... I was thinking of a
selecting address not a matching address.

Since the population consists of Item elements, none of them
match the pattern RepresentationTerm[.='Code']. Use

group-starting-with="Item[RepresentationTerm='Code']"

A bit of a gotcha - only this morning I found someone doing select="para"
group-by="para/title". Oh for a context-free language!

Michael Kay
http://www.saxonica.com/

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