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TRUEThis is the boolean value TRUE.
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FALSEThis is the boolean value FALSE.
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UNKNOWNYou can use the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value. Example Suppose a model with an entity Person and attributes Person.name and Person.age. In runtime, a user fills out a form and enters his name, but forgets to fill out his age. As a result:
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