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Attribute	Schema Datatype or Enumeration	Usage	Definition	Business Rules
Code	text	Required

Specified the Code in the external code source.

A string pattern that identifies a concept as defined by the code system
System	URI	Required

Unique identifier for the external code source

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

Human readable name for the

external

code

source

system.
SystemVersion	text	Optional

Version or edition

Identifies the version of the

external

code

source.

system
href	URI	Optional	URI reference to the Code definition.
CommentOID See ODM2DEV-64	text	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.

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