R1160 - modelint/shlaer-mellor-metamodel GitHub Wiki
R1160 / 1:Mc
Scalar specifies value in zero, one or many Equivalence Criterion
Equivalence Criterion has value type specified by exactly one Scalar
An Equivalence Criterion compares the equality of some enumeration or boolean Scalar. This is an important constraint that should be applied.
A given Scalar may or may not provide the type required by any number of Equivalence Criterion, including none at all.