[xquery-talk] XQuery Feature: Grouping
jonathan.robie at datadirect.com
Mon Feb 27 11:24:01 PST 2006
Martin Probst wrote:
> Grouping of nodes based on equality of some property of them, e.g.
> Group so that I have a link from <author/>s to <book/>s.
> I know this is currently achievable using the distinct-values function
> (for $author in d-v(book/author) return book[author = $author]), but
> this is not very obvious for users, hard to detect for databases, plus
> it atomises the <author/> node. I remember XQuery was once advertised as
> making it a lot easier to do such "turning XML inside-out" stuff - I
> don't really consider this to be that easy ...
So for your needs, it would be adequate if grouping were based on leaf
nodes, using the typed value as the basis for comparison?
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