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A select expression consists of a primary expression and an expression body ... separated by a dot-question-mark (.?) symbol. The expression body must have a single input parameter and a Boolean result.

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Mass Roll-up Example: MassRollup.sysml
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OMG Kernel Modeling Language™ (KerML™) Version 1.0
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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A select expression consists of a primary expression and an expression body ... separated by a dot-question-mark (.?) symbol. The expression body must have a single input parameter and a Boolean result.
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The expression body is evaluated on each of the result values from the primary expression, in order, and those for which the expression body evaluates to true are selected for inclusion in the result of the select expression (that is, a select expression
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(that is, a select expression is a shorthand for invoking the ControlFunctions::select function).
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