terminology
The terminology value used in a retrieve expression to filter retrieved resources. May be a qualified identifier referencing a declared value set, code system, or code, or any expression that evaluates to a terminology value.
Examples
Named value set reference
[Condition: "Diabetes Mellitus"]
Named code reference
[Condition: "Diabetes mellitus type 2"]
Expression producing a value set
[Condition: code in "Diabetes Mellitus Codes"]
EBNF
terminology : qualifiedIdentifierExpression | expression ;