Construct a boolean value from an item value.

Related Syntax Constructs

The following construct(s) refer to this construct:

---

Syntax

xs:boolean(item $value) => boolean

Description

This is a constructor function that takes an item value as argument and returns a value of type xs:boolean. If the argument is a literal, then the literal must be a valid lexical form of its type.

As specified in the respective section of the W3C recommendation XML Schema Part 2: Datatypes, a value of type xs:boolean represents a value to denote binary-valued logic. The lexical representation for "true" is the set of values {"true", 1}; for false it is the set of values {"false", 0}.

Argument

$value	item value

Examples

• Generate the boolean value "true":

  xs:boolean("1")

  xs:boolean("true")

• This query generates an error since the argument is interpreted as a path expression:

  xs:boolean(true)