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Continuation
A continuation is an interaction fragment that is used with alternative and weak sequencing combined fragments. It is a device that expresses the continuation of the different branches of the enclosing combined fragment.
Explanation
A continuation has the appearance of a state and must straddle all lifelines within the enclosing combined fragment. It is a mechanism that indicates how a combined fragment will continue and is thus located either in the first or the last interaction operand of the enclosing combined fragment. A continuation can be seen as a type of label that specifies what must follow in the next interaction operand.
A alternatives combined fragment is related to a continuation in that the alternatives combined fragment is one of two types of combined fragments that can be used with a continuation. The other being a weak sequencing combined fragment.
A weak sequencing combined fragment is related to a continuation in that the weak sequencing combined fragment is one of two types of combined fragments that can be used with a continuation. The other being an alternatives combined fragment.
A lifeline is related to a continuation in that a continuation is said to cover one or more lifelines. The continuation has a global scope with respect to the lifelines contained in a combined fragment and must therefore cover (straddle) all lifelines enclosed within the combined fragment.
