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Qualifier Notes
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The CTS Messaging API defines an interface that supports Qualifiers, as specified in the HL7 Version 3 Data Types Specification
The HL7 Version 3 Concept Descriptor (CD) Data Type includes a Qualifier component, which can "..constrain the meaning of the primary code, but cannot negate it or change it's meaning to that of another value in the primary coding system". The qualifier field is a list of Concept Role elements, which carry a name/CD tuple.
The CD specification includes the ability to test for equality and subsumption.
