| XQUERY/XSLT API DOCUMENTATION 4.2 |
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This page was generated September 12, 2012 6:01 AM | XQuery & XSLT Built-In & Modules Function Reference
Built-In: Boolean
The boolean built-in functions are XQuery functions to manipulate xs:boolean values. They are defined in XQuery 1.0 and XPath 2.0 Functions and Operators.
Function Summary
fn:false | Returns the xs:boolean value false.
fn:not | Returns true if the effective boolean value is false, and false if the effective boolean value is true.
fn:true | Returns the xs:boolean value true.
Function Detail
fn:false( ) as xs:boolean
Summary: Returns the `xs:boolean` value `false`. Equivalent to `xs:boolean("0")`.
Example:
    fn:false()

    => false
fn:not(
| $arg as item()*
) as xs:boolean
Summary: Returns `true` if the effective boolean value is `false`, and `false` if the effective boolean value is `true`. The `$arg` parameter is first reduced to an effective boolean value by applying the `fn:boolean` function.
Parameters:
$arg : The expression to negate.
Example:
    fn:not(fn:true())

    => false
Example:
    fn:not("false")

    => false
fn:true( ) as xs:boolean
Summary: Returns the `xs:boolean` value `true`. Equivalent to `xs:boolean("1")`.
Example:
    fn:true()

    => true

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