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They differ in the context of incoming
and outgoing transitions.
An entry point describes a special entry into a state machine. A transition leads
from the entry point to a state of the state machine, or to one state each of every
region in case of an orthogonal state.
An exit point terminates a state machine. If a transition from any region in the
state machine reaches an exit point, then the state machine is terminated, and the
transition originating from the exit point is activated.
An entry point is denoted as a white circle, and the exit point as a circle with a
cross. Viewed from the outside the circle appears on the border of the corresponding
state. In the inner view, transitions terminate or start at the circle ( Figure 3.68 ).
3.8 Interaction Diagrams
In UML ??? interaction diagram ??? is a generic term for sequence diagram, communication
diagram, timing diagram, and interaction overview diagram. Since SysML uses
only the sequence diagram the other diagram types will not be discussed in detail
in this book.
3.


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