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AT:

there exists the following attributes which can be set on a call activity
- caseRef (key of the case definition)
- caseBinding (latest, version, deployment)
- caseVersion (the version of the case definition)
it is also possible to use the extension elements "in" and "out" to define which variables or business key should be passed to the case instance and/or which variables should be passed back to process instance
reaching such a CallActivity during the runtime a new case instance will be created
HistoricActivityInstance should be extended by a new field "calledCaseInstanceId"
there exists query possibilities to query (including REST API)

To be discussed:

when should the CallActivity-Execution be signaled:
- when the case instance completed successfully the first time?
- when the case instance has been closed?
- what about termination?

is related to

CAM-3855 I can use expressions for the element version of a call activity

CAM-3479 Process stops at CallActivity after completing CMMN Case

CAM-3854 I can use expressions for the element version of a call activity in the modeler

CAM-3365 Document how to use the CallActivity to create a new CaseInstance