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A RESTful browser for eXist Java-Based Function Modules
Modules
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xpath-functions
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zero-or-one
http://www.w3.org/2005/xpath-functions
A module with the XQuery/XPath Core Library Functions
zero-or-one
zero-or-one($arg as item()*) item()?
Returns the argument sequence $arg if it contains zero or one items. Otherwise, raises an error.
$arg
The sequence to be tested for cardinality
Returns the input sequence if it contains zero or one items.
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