Creates a new QName with a local name specified $string-var and no namespace.
If the value of $string-var is the empty sequence, the empty sequence is returned. The empty sequence is a sequence containing zero items (), which is similar to null in SQL.
xs:QName(xs:string $string-var) —> xs:QName
Returns the $string-var converted to the QName data type.
W3C QName data type description