R833 - modelint/shlaer-mellor-metamodel GitHub Wiki

R833 / 1:1c

Activity Input gets value from exactly one Data Flow

Data Flow provides value for zero or one Activity Input

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An Activity Input defines the input of a value provided by a required Parameter in a given Activity.

Since a Parameter can yield any kind of data (instances, relations, scalar values), it is supplied by a Data Flow.

A given Data Flow may or may not be used for the purpose of supplying a Parameter value.