R157

R157 / 1:1

Simple Association Reference is housed in exactly one Referring Class

Referring Class houses exactly one Simple Association Reference

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An Association that is not formalized by an Association Class is formalized by one of its participating Classes in the direction of a one-unconditional Perspective.

By 'housed' in a Class, we mean that the Reference's referential attributes are all defined in that Class.

Formalization

Simple Association Reference.(From class, Rnum, Domain) -> Referring Class.(Class, Rnum, Domain)