Is there a way to create relationships between items, such as one-to-many or composition?

New Answer (May 2009, although this was released a few months ago): Yes.   We now call this feature “Related Items.”  We have added support to the base thing type which understands how to link to the GUIDs of other specific HealthRecordItem instances. For more information and some sample code, check out Eric Gunnerson’s tutorial post on Related Items.   ——–…

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