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New features in this release focus on updates of the value set loading system.  Since the source of value sets it is the NCI Thesaurus (NCIt), and since the NCIt contains logical, computable assertions about what value sets are in it’s its system, business logic has moved towards direct access to the code system rather than external defining files.  This has been a collaborative effort with NCIt curators and has resulted in improved loading efficiency of value set definitions and resolved value set coding schemes. 

This release will also contain a prototype of a direct to source value set resolution and search service, based on the kind of assertions the NCIt makes about it’s its value sets.  Terminologies that make similar assertions my also make use of this API.  It should make some earlier value set API’s obsolete while retaining the ability of users to define and load their own value sets.

Many issues were reported with the large amount of new code written around value set loading and access.  This includes fixes to resolving value set function as well as value set hierarchy functions.  This also contains fixes to long standing history load issues, some tree extension issues and simple search api API problems.  We updated an outdated tracking policy artifact in this release as well — removing a couple of failing value sets that were placeholders for issues that should be resolved.  This allows continuous integration to be more accurate and precise without any expected failures that can be ignored.