A RESTful browser for eXist Java-Based Function Modules

http://www.w3.org/2005/xpath-functions
A module with the XQuery/XPath Core Library Functions
exactly-one
exactly-one($items as item()*) item()
Returns the argument sequence, $items, if it contains exactly one item. Otherwise, raises an error.
$itemsThe item sequence
Returns the sole item in $items if it contains exactly one item. Otherwise, an error is raised.
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