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Signals are defined within a macrostate. They are visible in this macrostate and the children states. 

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Interfaces declarations in Yakindu SCT

Declarations in the interface scope are externally visible.

 Declarations made in an internal scope are only visible for contained states.

All declarations are made in the interface scope.

Interface declarations on region level are more complex. They are not planned at the moment. Regions are no scoped elements.