boolean()

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The boolean() function converts its argument to a boolean value. Any value can be converted to a boolean using the following rules:

Datatype	Conversion Rules
Number	Zero, negative zero, and NaN convert to false. Everything else converts to true.
String	Length greater than 0 converts to true. Otherwise false.
Boolean	Value is unchanged.
Node-set	Empty converts to false. Anything else is true.

Syntax:

boolean boolean(value) 

Arguments:

A value of any XSLT/XPath supported datatype.

Result:

A boolean.

Defined: XPath, section 4.3

NS support: Supported.