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UNKNOWN


You 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:

ExpressionResultTypeReason
Person.name = ?FALSEBooleanbooleanThis attribute is filled out
Person.age = ?TRUEBooleanbooleanThis attribute is not filled out, and therefore UNKNOWN

...