fn:function-arity

Returns the arity of the function identified by a function item.

function-arity($function as fn(*)) ➔ xs:integer

Arguments
	$function	fn(*)	The function item whose arity is required
Result		xs:integer

Namespace

http://www.w3.org/2005/xpath-functions

Links to W3C specifications

XPath 3.1 Functions and Operators

XPath 4.0 Functions and Operators

Saxon availability

Available in XPath 3.0, XSLT 3.0, XQuery 3.0, and later versions. From Saxon 10, available in all editions. Implemented in Saxon-PE and Saxon-EE since Saxon 9.6. Available for all platforms.

Notes on the Saxon implementation

Available in Saxon-HE since 10; in Saxon-PE/EE since 9.6.