![]() Each operand has a guard to test against and it is placed at the top left corner of the operand. 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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