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AttributeSchema Datatype or EnumerationUsageDefinitionBusiness Rule(s)
CodetextOptionalA string pattern that identifies a concept as defined by the code system.When not provided, all codes in the code system are allowed. For example, when referencing the complete set of codes from the MedDRA code system.
SystemURIRequiredIdentifies the code system that defines the code. If the code is taken from a code system resource then the URL for the code system should be used.
SystemNametextOptionalHuman readable name for the code system. 
SystemVersiontextOptionalIdentifies the version of the code system
LabeltextOptional

Used to link the value to a named MethodDef parameter.


hrefURIOptionalURI reference to the Code definition.
refURIOptionalReference to a local instance of the code system.
CommentOIDoidrefOptionalReference to a CommentDef that provides the rationale for the use of the Concept.Must match the OID attribute of a CommentDef element within in this Study/MetaDataVersion.
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