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Value sets asserted by the terminology source (Source Asserted Value Sets), provide a complete definition of value sets in static terms  It does not require resolving a graph, or a union of a variety of sources to achieve its definition.  At the same time the root (or target) entity of the asserted values carries adequate metadata to define what former resolved value set coding scheme represented without the workflow complexity of having to create separate coding scheme database entries.  This resulted in higher performing value set retrieval and eliminated very lengthy loading times.  

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  At the same time this would change the way that value sets are made available to end users meaning query mechanisms and Java and REST api results would retrieve far fewer value sets than before.

Recommendation

Create a Source Asserted Value Set API and Search mechanism.  Update current Resolved Value Set and CTS2 functions to allow source asserted values to be retrieved along with traditional value sets.