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Learn more about the logical functions AND, OR, NOT, logical values TRUE, FALSE, and the special meta-value UNKNOWN. 

Overview

Function / valueDescription
ANDReturns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE.
NOTReverses the value of its boolean argument.
ORReturns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE.
UNKNOWNUse the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value.
TRUEThis is the boolean value TRUE.
FALSEThis is the boolean value FALSE.

Functions

AND


Returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE.


Syntax

argument1 AND argument2 [AND ...]



Inputs
  • argument1 - The first boolean condition that you want to evaluate.
  • argument2 - The first boolean condition that you want to evaluate.
  • [AND …] - Additional boolean conditions that you want to evaluate. (optional)


Return type

  • boolean


Examples

ExpressionResultType
TRUE AND TRUETRUEboolean
TRUE AND FALSE

FALSE

boolean
TRUE AND ? (= UNKNOWN)UNKNOWNboolean
FALSE AND ? FALSEboolean



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OR


Returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE.


Syntax

argument1 OR argument2 [OR ...]


Input

  • argument1 - The first boolean condition that you want to evaluate. argument2 - The first boolean condition that you want to evaluate. [OR …] - Additional boolean conditions that you want to evaluate.


Return type

  • boolean


Examples

ExpressionResultType
TRUE OR TRUE

TRUE

boolean
TRUE OR FALSETRUEboolean
FALSE OR FALSEFALSEboolean

TRUE OR ? (= UNKNOWN)

TRUEboolean
FALSE OR ? (= UNKNOWN)UNKNOWNboolean


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NOT


Reverses the value of its boolean argument.


Syntax

NOT argument


Input
  • argument - The boolean condition of which you want to reverse its value.


Return type

  • boolean


Examples

ExpressionResultType
NOT (TRUE)FALSEboolean
NOT (TRUE AND FALSE)TRUEboolean
NOT ( ? (= UNKNOWN) )UNKNOWNboolean
NOT (NOT (TRUE))TRUEboolean




Using brackets is not required, but advised to clearly indicate which boolean condition needs to be reversed.


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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:

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

TRUE


This is the boolean value TRUE.

FALSE


This is the boolean value FALSE.



4 Comments

  1. Unknown User (d.van.der.poel)

    I was wondering in what order logical operators are processed. My assumption was AND first, then OR. It seems that it is neither that nor the other way around:


    FALSE AND FALSE OR TRUE --> TRUE (consistent with AND first, inconsistent with OR first)

    TRUE OR FALSE AND FALSE --> FALSE (consistent with OR first, inconsistent with AND first)

    Both: consistent with ( ( A operator B ) operator C )


    Edit: corrected a copy-paste error

    1. Unknown User (m.gulpers)

      I always learned to use brackets. When omitted, expect anything, even the spanish inquisition.

  2. Rory Tans

    In older documentation I saw a comment that there was a operator for exclusive or (Logical functions).

    Is there a build in operator or do i still model this like ?

    1. Louis Wouters

      You can use ' != ' (does not equal) to perform XOR on two boolean expressions.

      Note the difference between using ' != '  as ...

      • ... a check if an attribute/expression is known   ( entity.attribute != ? , green cells )
      • ... XOR ( expression != expression , blue cells )


      !=TRUEFALSEExpression resulting in ?

      Manual input of ?

      TRUEFALSETRUE?TRUE
      FALSETRUEFALSE?TRUE
      Expression resulting in ????FALSE

      Manual input of ?

      		TRUETRUEFALSEFALSE

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