Coding Attributes

Attribute	Schema Datatype or Enumeration	Usage	Definition	Business Rules
Code	text	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.
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.
SystemName	text	Optional	Human readable name for the code system.
SystemVersion	text	Optional	Identifies the version of the code system
Label	text	Optional	Used to link the value to a named MethodDef parameter.
href	URI	Optional	URI reference to the Code definition.
ref	text	Optional	Reference to a local instance of the code system.
CommentOID	oidref	Optional	Reference 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.

Page tree