FunctX XSLT Function Library > Atomic Values of All Types > Boolean >

fn:not

Negates a boolean value

Description

The fn:not function accepts a sequence of items, from which it calculates the effective boolean value of the sequence as a whole before negating it. This means that when $arg is either a single boolean value false, a zero-length string, the number 0 or NaN, or the empty sequence, it returns true. Otherwise, it returns false.

This description is © Copyright 2007, Priscilla Walmsley. It is excerpted from the book XQuery by Priscilla Walmsley, O'Reilly, 2007. For a complete explanation of this function, please refer to Appendix A of the book.

Arguments and Return Type

Examples

not(32 > 20)

false

not(doc(
   'http://www.functx.com/input/catalog.xml')
   //product)

not(true())

false

not(())

true

not('')

true

not(0)

true

not(<e>false</e>)

false

See Also

History