Identifier Domain Defining Diagram
Means by which an "Agent" may collect two or more "Identifiers In Domain".
Associations From:
Only One domain Many Identifier In Domain
Associations To:
Zero, One or Many agent responsible for Only One Agent

Identifier In Domain Defining Diagram
"Subject Identifier" which is unique within an "Identifier Domain".
Associations To:
Many domain Only One Identifier Domain
Supertypes:
Subject Identifier