SAXONICA

Saxon Documentation
Full Contents
About Saxon
Changes in this Release
Conditions of Use
Using XSLT 2.0
Using XQuery
Handling Source Documents
XML Schema Processing
The XPath API
Standards Conformance
Extensibility
Saxon Extensions
Sample Saxon Applications
The Saxon SQL Extension
XSLT Elements
XPath 2.0 Expression Syntax
Function Library
XSLT Patterns

# fn:exactly-one

fn:exactly-one($srcval as item*) as item?

Function signature

$srcval | item() *
Result | item() ?

Checks whether $srcval contains exactly one item; fails if it is empty or contains multiple items.

XPath 2.0 Specification

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