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Interaction operators: negation

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(1)

Modelling with UML, with semantics 163

Interaction operator ref & parameters

ref

refers to a fragment defined elsewhere (macro-expansion)

Formal and actual parameters (bindings) are declared in the diagram head.

Signals to the containing classifier appear as arrows form the diagram border.

declaration

call

(2)

Modelling with UML, with semantics 164

Interaction operators: negation

The semantics of neg and assert is unclear.

In contrast to that the other operators, they refer not just to the positive traces, but to invalid and inconclusive traces as well.

neg

declare all valid traces as invalid

inconclusive traces: unknown

assert

remove uncertainty by declaring all inconclusive traces as invalid

(3)

Modelling with UML, with semantics 165

Wrap up

Complex interactions like high-level MSCs added.

New diagram types:

timing diagrams (like oscilloscope), and

interaction overview (similar to restricted activity diagram)

renamed collaboration diagram to communication diagram

Completely new metamodel.

Almost formal three-valued semantics of valid, invalid and inconclusive interleaving traces of events.

Some semantical problems are yet to be solved.

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