fn:starts-with-subsequence

Determines whether one sequence starts with another, using a supplied callback function to compare items.

starts-with-subsequence($input as item()*, $subsequence as item()*, $compare as (fn(item(), item()) as xs:boolean?)?:=fn:deep-equal#2) ➔ xs:boolean

Arguments
	$input	item()*		The input sequence
	$subsequence	item()*		The subsequence to check for
	$compare	(fn(item(), item()) as xs:boolean?)?	:= fn:deep-equal#2	A comparison function
Result		xs:boolean

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.

Notes on the Saxon implementation

Available since Saxon 13 in XPath 4.0. Available since Saxon 12.0 under the previous name fn:starts-with-sequence provided that syntax extensions are enabled.