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FHIR Filter-operator Page

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This page contains discussion about issues and considerations related to HL7's FHIR specification. When adding content to a page, be sure to uncomment the "Active" category if it is commented (surrounded by <!-- and -->) so that others can notice it and participate too.

Welcome to "Filter-operator" discussion page. Please put any comments about this page here. Contents will be reviewed periodically.

Discussion

The is_a relationship is a transitive relationship. It is not clear from this definition of the operators whether (often implicit) transitive is_a relationships are considered. For example, is A is_a B, and B is_a C, then does the is_not_a operator match on A, C or not? [I would hope not!]

This is particularly significant when considering SNOMED CT and its derivatives. As a special case, the current V2 series of the Australian Medicines Terminology (AMT) is distributed in so-called Stated Form rather than Distribution Normal Form which means that many is_a relationships are actually omitted (and this is a slightly different case from the simple transitive closure case mentioned above).

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