exactly-one

exactly-one($arg as item()*) → item()

Arguments

 

$arg

item()*

The sequence to be tested

Result

item()

Links to W3C specifications

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

Applies to: XPath 2.0, XSLT 2.0, XQuery 1.0 and later versions

XPath 2.0 Functions and Operators

XPath 3.0 Functions and Operators

Notes on the Saxon implementation