> Well perhaps I've found a solution...it appears to be working 
> anyhow.  Any 
> comments would be welcome.

I like it!  Interesting way to form a group.

It might be slow for large source documents, maybe order(N*N)
where N is the number of ele elements (because for each element you
have to sum all preceding elements); but I can't see a way
around that... unless you want to recursively loop through the elements,
keeping a running total.

Lars


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