Boolean Functions

Boolean functions return true (1) or false(0) values. The following boolean functions are available:

• xf:false
• xf:not
• xf:true

xf:false

Returns the boolean value false.

Data Types

• Input data type: No input data required.
• Returned data type: xs:boolean

XQuery Specification Compliance

Conforms to the current specification.

Examples

• xf:false() returns false.
• xf:false(34) generates a compile-time error because the function does not accept any parameters.

 

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xf:not

Returns true if the value of the source value is false and false if the value of the source value is true.

Data Types

• Input data type: xs:boolean?
• Returned data type: xs:boolean?

XQuery Specification Compliance

• Liquid Data accepts an optional boolean value instead of a sequence as input.
• Liquid Data returns a true value if the input is an empty list.
• Liquid Data returns an optional boolean value instead of one boolean value.

Examples

• xf:not(xf:false()) returns the boolean value true.
• xf:not(xf:true()) returns the boolean value false.
• xf:not(32) generates a compile-time error because the input value is not boolean.
• xf:not(()) returns the boolean value true.

 

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xf:true

Returns the boolean value true.

Data Types

• Input data type: No input data required.
• Returned data type: xs:boolean

XQuery Specification Compliance

Conforms to the current specification.

Examples

• xf:true() returns true.
• xf:true("34") generates a compile-time error because the function does not accept any parameters.