fn:index-where

Returns the positions in an input sequence of items that satisfy a supplied predicate.

index-where($input as item()*, $predicate as fn(item(), xs:integer) as xs:boolean?) ➔ xs:integer*

Arguments
	$input	item()*		The input sequence
	$predicate	fn(item(), xs:integer) as xs:boolean?		The predicate function
Result		xs:integer*

Namespace

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

Links to W3C specifications

XPath 4.0 Functions and Operators

Saxon availability

Available in XPath 4.0, XSLT 4.0, and XQuery 4.0, provided that 4.0 features are enabled (see Enabling 4.0 features). Requires Saxon-PE or Saxon-EE. Implemented since Saxon 11. Available for all platforms.

Notes on the Saxon implementation

Available since Saxon 13 in XPath 4.0. Available since Saxon 11 provided that syntax extensions are enabled.