The members of the owner-object associated with the role. An expression that indicates which members of the owner-object are represented by a role.
Any conditional expression involving fields from the owner-object only. If the role condition is omitted, the associated role name applies to all members of the owner-object.
For example, a role called NYEmps whose owner is the Employees entity set might use the role condition:
Employees.Location = “New York”
The role NYEmps therefore refers only to those Employees that work in New York.