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There are accordingly some key aspects of the relationship between archetypes / templates and ref sets.
Ref set definition language (aka Terminology query language)
Intentional ref sets, of which static or extensional ref sets are a special case, are defined by a specialised query language that includes operators for selection, exclusion, comparison, as well as some means of influencing the structure of the result. There is currently no standard language for this, although there are activities with both IHTSDO and OMG/HL7 (CTS2) to create such a language.
Currently there are ref set languages included in a number of terminology products, and also the NHS edition of the IHTSDO workbench.
Languages whose definition are currently openly available include the following:
Design of ref sets
The design of intentional ref sets will be carried out by clinicians and other experts in response to data points found in archetypes, or more frequently templates. We expect that many ref sets will be for local use and so it makes sense that these relationships are defined within templates. There is still the need to know which ref set provides the value set for which node or nodes in a template or archetype.
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