To enforce ordering of an evaluation, sequencing constraints may be specified among clauses. The result may therefore be nondeterministic if more than one test section can be true concurrently. In general, a test section may be executed in any order, including simultaneously if the underlying execution architecture supports it. If no test section yields a true value, then no body section is executed this may be a semantic error if output values are expected from the conditional node. The choice is non-deterministic, unless the test sequence of clauses is specified.If more than one test section yields a true value, only one body section will be executed.If one or more test sections yield a true value, one of the corresponding body sections will be executed.When the conditional node begins execution, the test sections of the clauses are executed. Conditional NodeĪ conditional node is a structured activity node representing an exclusive choice among a number of alternatives.Ī conditional node consists of one or more clauses, each consisting of a test section and a body section. When combined with flows, actions must also satisfy their control and data flow inputs before starting execution. When the sequence node is enabled, its executable nodes are executed in the order specified. It prints a corresponding message based on whether letter is B, C, A, or none of the specified values, demonstrating a sequential evaluation of conditions for controlled branching. To show behavior you can use sequence diagrams, and a condition in sequence diagram is shown be be a rectangle which in its top corner you write the condition and inside it you describe the operation that occurs if condition is true. Sequence NodeĪ sequence node is a structured activity node that executes its actions in order. In this example, the code uses an if-elif-else statement to evaluate the value of the variable letter. Class diagrams does not show behavior, but only structure. The results of the final execution of the test or body are available after execution of the loop is completed. If more than one test section yields a true. If one or more test sections yield a true value, one of the corresponding body sections will be executed. The setup section is executed once on entry to the loop, and the test and body sections are executed repeatedly until the test produces a false value. A conditional node consists of one or more clauses, each consisting of a test section and a body section. The test section may precede or follow the body section. A loop node is a constructed activity node representing a loop with setup, test, and body sections.Įach section is a well-nested subregion of an activity whose nodes follow any predecessors of the loop and precede any successors of the loop.
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