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What UML does define is the syntax of a
language, i.e., the exact syntax of statecharts, class diagrams, sequence
diagrams and so forth. As to the meaning of these diagrams, e.g., the meaning of
a guard in a statechart, the meaning of a protected member in a class, the
meaning of a method call or message sent from an object to another in the
sequence diagram, and so forth, there is no formal definition.
Thomas Feng
2003-04-18