fn:exactly-one
Checks whether $arg contains exactly one item; fails if it is empty or
contains multiple items.
exactly-one($arg as item()*) ➔ item()
Arguments | |||
| $arg | item()* | The sequence to be tested |
Result | item() | ||
Namespace
http://www.w3.org/2005/xpath-functions
Links to W3C specifications
XPath 2.0 Functions and Operators