| Property
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Description
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|---|
| Operator
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Specifies the type of fragment. You can choose between:
- Alternative (alt) – the fragment is split into two or more mutually exclusive regions, each of which has an associated guard condition. Only the messages from one of these regions will be executed at runtime.
- Assertion (assert) – the interaction must occur exactly as indicated or it will be invalid.
- Break (break) – if the associated condition is true, the parent interaction terminates at the end of the fragment.
- Consider (consider) – only the messages shown are significant.
- Critical Region (critical) – no other messages can intervene until these messages are completed.
- Ignore (ignore) – some insignificant messages are not shown.
- Loop (loop) – the interaction fragment will be repeated a number of times.
- Negative (neg) – the interaction is invalid and cannot happen.
- Option (opt) – the interaction only occurs if the guard condition is satisfied.
- Parallel (par) – the fragment is split into two or more regions, all of which will be executed in parallel at runtime.
- Strict Sequencing (strict) – the ordering of messages is strictly enforced.
- Weak Sequencing (seq) – the ordering of messages is enforced on each lifeline, but not between lifelines.
The operator type is shown in the top left corner of the interaction fragment symbol.
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| Stereotype
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Extends the semantics of the object beyond the core UML definition.
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| Condition
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Specifies any condition associated with the fragment. This may be the evaluation of a variable, such as:
X > 3
Or, for a loop fragment, the specification of the minimum and (optionally) maximum number of times that the loop will run. For example:
1,10
For the Consider or Ignore operators, this field lists the associated messages.
This field is not available if the fragment does not support conditions.
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