fn:while-do

Processes a supplied value repeatedly, continuing while some condition remains true, and returning the first value that does not satisfy the condition.

while-do($input as item()*, $predicate as fn(item()*, xs:integer) as xs:boolean?, $action as fn(item()*, xs:integer) as item()*) ➔ item()*

Arguments
	$input	item()*	The input value
	$predicate	fn(item()*, xs:integer) as xs:boolean?	The predicate function
	$action	fn(item(), xs:integer) as item()	The function to be applied to the value iteratively
Result		item()*

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. Requires Saxon-PE or Saxon-EE. Implemented since Saxon 13. Available for all platforms.