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Subsumption expansion functions
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This change adds new functions and UDFs to enable the query of codings that either subsume or are subsumed by an input coding. This differs from the current subsumes / subsumedBy functions in that it returns a collection (or array in the case of the UDFs) of codings, rather than testing a coding and returning a boolean value.
These functions are:
ancestorsAndSelfancestorsdescendantsdescendantsAndSelf