CTS2 DSTU Corrections and Enhancements

Corrections:

#	Description	Rationale	Resolution
1	Hierarcy in Concept Domain	There is no hierarchy present in the ConceptDomains in the conceptual model. This can be achieved in two ways. The simplest way is by adding a recursive link in the conceptual diagram, as well as mentioning this fact in the Core Principle text. There is another way through which this can be achieved, by adding associations between concepts domains. This will allow for finer typing of the relationships between concept domains, not just parent-child relationships.

The following are enancements to the DSTU from a functional point of view. Some of them are present in the PIM but not in the DSTU, so they might be an oversight. Some operations too are also an obvious oversight, so they are not really enhancements.

Enhancements:

#	Description	Rationale	Resolution
1	Binding to a single code.	The way the HL7 CTS2 Conceptual model is now does not allow for the binding of a single code; the binding being done through a ValueSetContextBinding. Use a link between the CodeSystemConceptCode and ValueSetContextBinding.		2	Change ValueSetContextBinding into Binding	The binding is not just done through just the value sets as mentioned it can be done through a code. Furthermore, there are value sets that are not bound to the UsageContext only but also to the Concept Domain (like in the MIF file).	Use a link between the CodeSystemConceptCode and ValueSetContextBinding.