| Attribute | Schema Datatype or Enumeration | Usage | Definition | Business Rules |
|---|---|---|---|---|
| Code | text | Required | Specified the Code in the external code source. | |
| System | URI | Required | Unique identifier for the external code source. | |
| SystemName | text | Optional | Human readable name for the external code source. | |
| SystemVersion | text | Optional | Version or edition of the external code source. | |
| href | URI | Optional | URI reference to the Code definition. | |
| CommentOID See ODM2DEV-64 | text | Optional | Reference to a CommentDef. | Must match the OID attribute of a CommentDef element within in this Study/MetaDataVersion. |
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