not()

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The not() function returns the boolean negation of its argument.

Syntax:

boolean not(expression) 

Arguments:

Either a boolean or an expression that evaluates to a boolean, using the rules of the boolean () function.

Result:

The negation of the argument value: false if the argument is true, true if the argument is false.

Defined: XPath, section 4.3.

NS support: Supported.