fn:boolean
Obtains the effective boolean value of the supplied argument. The result is true if the
argument value is a sequence starting with a node, or the singleton boolean
true(), a singleton non-zero number, or a singleton non-zero-length string
(or untypedAtomic). The result is false if the argument is an empty sequence, the
singleton boolean false(), a singleton number zero or NaN, or a singleton
zero-length string (or untypedAtomic). In all other cases the result is an error.
boolean($arg as item()*) ➔ xs:boolean
Arguments | |||
| $arg | item()* | The sequence whose effective boolean value is required |
Result | xs:boolean | ||
Namespace
http://www.w3.org/2005/xpath-functions