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If you are modeling an active State configuration on a StateMachine diagram, and you need to represent several States as being active concurrently, you can achieve this by firstly creating a StateMachine element or Composite State element and secondly subdividing that element into Regions. You set out the State configuration such that there is only ever one of the concurrently active States per Region. Multiple transitions can occur from a single event dispatch, so long as the similarly-triggered transitions are divided by Regions.

Regions display on an element on a diagram as subdivisions of a structured compartment, underneath other compartments such as tags, responsibilities, attributes and operations.


Context Menu

Right-click on element | Advanced | Define Concurrent Substates

Create a Region in a Composite State or StateMachine element




On the 'State Regions' dialog, the 'Name' field defaults to '<anonymous>'.


If you want to create Regions that have no title, simply click on the Save button once for each Region to create.

If you want to create named Regions, type the name and click on the Save button for each Region.


When you have created as many Regions as you need, click on the Close button.

You can now populate the Regions with elements from the 'State' pages of the Diagram Toolbox.


  • Changes to the elements in a Region are committed when the diagram is saved; if you want to undo the changes, reload the diagram without saving
  • Any States, State Nodes (Pseudo-States) or Synch elements added to a Region are owned by that Region and, ordinarily, cannot be dragged into another Region; however, if you attempt to drag a State between Regions, the 'Move embedded element to region' menu option displays which - if you select it - allows the transfer to complete

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