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The SNOMED CT Compositional Grammar allows

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tSNOMED CT expressions
to be represented as a text string that can be carried in messages. For example, in
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tHL7
version 3 messages SNOMED CT expressions can be placed in the 'code' property of the ConceptDescriptor (CD) data type (Release 2). The compositional grammar described in this document is intended to replace the 
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tqualifier
 mechanism that formerly was in the CD data type (Release 1), and which was removed in Release 2.

In September 2009, the

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Version 3 Standard "Data Types - Abstract Specification, Release 2" was published for its fourth normative membership ballot. This revised standard defined what can be carried in the 'code' property of the CD data type as shown below in Table 1.

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