States are the basic units of the state machines. In UML 2.0
states can have substates. Execution of the diagram begins with
the Initial node and finishes with Final or Terminate node or
nodes. Please refer to UML 2.0 Specification for more
information about these elements. State Machine diagrams
describe the logic behavior of the system, a part of the system,
or the usage protocol of it. On these diagrams you show the
possible states of the objects and the transitions that cause a
change in state. State Machine diagrams in UML 2.0 are different
in many aspects compared to Statechart diagrams in UML 1.5.
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