fn:exactly-one
Checks whether $input contains exactly one item; fails if it is empty or
contains multiple items.
exactly-one($input as item()*) ➔ item()
Arguments | ||||
| $input | item()* | The sequence to be tested | |
Result | item() | |||
Namespace
http://www.w3.org/2005/xpath-functions
Links to W3C specifications
XPath 3.1 Functions and Operators
XPath 4.0 Functions and Operators
Saxon availability
Available in XPath 2.0, XSLT 2.0, XQuery 1.0, and later versions. Available in all Saxon editions. Available for all platforms.