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UNKNOWN
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:
| Expression | Result | Type | Reason |
|---|---|---|---|
| Person.name = ? | FALSE | boolean | This attribute is filled out |
| Person.age = ? | TRUE | boolean | This attribute is not filled out, and therefore UNKNOWN |
TRUE
This is the boolean value TRUE.
FALSE
This is the boolean value FALSE.
Overview
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