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Has anyone seen any ways to dynamically join data in services. E.g. I've already exposed County boundaries in a MapService, now I want to let users join their relative data to this service for their own thematic visualizations.

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Does your "relative" data have a key (like County_ID), or do you want to perform a spatial join (e.g. point in polygon)? – Kirk Kuykendall Feb 3 '12 at 15:43
A key, yes like County_ID. – Luke Feb 7 '12 at 23:29

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