The atomic dependency is the key to selecting dependencies between activity‑related objects. It contains an import usage and an export usage.
The import usage identifies the usage of the from object, and the export usage identifies the usage of the to object. To retrieve the name of the object, join the usage with the object's definition. All the atomic dependencies for a given dependency are collected by associating them with a dependency object, which also has a name.
In the following illustrations, from and to can be activity usage (ACTIV_USAGE), external object usage (XT_OBJ_USAGE), external event usage (XT_EVNT_USAGE), parallel construct (ADD_PARALLEL), mutually exclusive construct (ADD_MUTL_EXCL), or closure (ADD_CLOSURE), with the same constraints as are imposed by the ADD.
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