Region

Owning Palette: Statechart Development Objects

Requires: Statechart Module

Defines the area in which you can place states and pseudostates. Each region must contain an Initial pseudostate and at least one substate.

The top-level statechart diagram represents a region. You can place regions within only a state.

Add to the statechart diagram

Find on the palette

Using regions allows you to place states within states, as the previous figure shows. Two or more regions in the same state are called orthogonal regions.

When the statechart enters a region, the statechart enters the substate to which the Initial pseudostate is connected, except in the following situations:

• The statechart is following a transition directly to a substate.
• The statechart has entered that region at least once since you first executed the statechart, and the region contains a Shallow History or Deep History pseudostate.

In these situations, the statechart enters the substate that the transition or pseudostate specifies.