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not

The not function accepts a sequence of items, from which it calculates the effective boolean value of the sequence as a whole before negating it.

fn:not(arg)

The following table describes the argument for this command:

Argument	Required/ Optional	Description
arg	Required	The boolean expression you want to negate. This can be a boolean value or None .

The

$arg

is first reduced to an effective boolean value by applying the

fn:boolean()

function. Returns

true

if the effective boolean value is false or None, and false if the effective boolean value is true.

The following table lists some sample values and return values:

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