Optional | A 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. |
System | URI | Required | Identifies 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. |
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SystemName | text | Optional | Human readable name for the code system. |
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SystemVersion | text | Optional | Identifies the version of the code system |
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Label | text | Optional | Used to link the value to a named MethodDef parameter. |
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href | URI | Optional | URI reference to the Code definition. |
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ref | URI | Optional | Reference to a local instance of the code system. |
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CommentOID | oidref | Optional | Reference to a CommentDef |