To show two or more alternatives, the larger rectangle is then divided into what is called interaction operands using a dashed line, as shown in the sequence diagram example above. The alternative fragment is represented by a large rectangle or a frame it is specified by mentioning ‘alt’ inside the frame’s name box (a.k.a. The alternative combination fragment is used when a choice needs to be made between two or more message sequences. This – the fragment operator – specifies what sort of a fragment it is. On the top left corner of the fragment sits an operator. It is used to show complex interactions such as alternative flows and loops in a more structured way.
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