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, provided that 4.0 features are enabled (see Enabling 4.0 features). Requires Saxon-PE or Saxon-EE. Implemented since Saxon 13. Available for all platforms.