Class Accessor

A Select Action takes an input Non Scalar Flow and applies criteria to yield an output of filtered instance references. (See R876 for an explanation of how this applies when the input is a Relation Flow).

Often this input is the output of some other Action. But we often perform a selection on the entire population of some Class. The class accessor produces the required input for our Selection Action.

Specifically, for a given Class, a Multiple Instance Flow is output which conveys a set of instance references to the entire population of that accessed Class. This output can be the input to any Action that operates on a total class instance population. Typically this will be a Select Action.