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|Rule: EmptyGroup||Category: Completeness|
|Severity: 2-med||Applies to: all areas|
|The activity group does not contain any nodes or subgroups.|
Add nodes to the activity group, or delete it from the model.
|Rule: NoExpansionNode||Category: Completeness|
|Severity: 1-high||Applies to: all areas|
|The expansion region has no expansion node.|
An expansion region must have at least one input expansion node. This is a WFR of the UML.
|Appendix C.18 "State Rules"||Contents||Appendix C.20 "Action Rules"|