| Attribute | Schema Datatype or Enumeration | Usage | Definition | Business Rules |
|---|---|---|---|---|
| Dictionary | text | Optional | The name of the external dictionary or external reference as listed in the NCI/CDISC Controlled Terminology, CodeList Dictionary Name, NCI Code C66788. This CodeList is extensible. Samples: COSTART, ICD, LOINC, MedDRA, SNOMED, WHOART, WHODD | |
| Version | text | Optional | The version of the external codelist. | |
| ref | text | Optional | Reference to a local instance of the dictionary. | |
| href | URI | Optional | A resolvable URL to an external instance of the dictionary is preferred, however a non-resolvable URN, such as an OID or UUID, may be used. |
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