Returns a string containing a QName representing the expanded name of the node in the argument node-set that is first in document order.
string name(node-set?)
The QName must represent the expanded name with respect to the namespace in effect on the node. This need not be the case if there are namespace declarations in effect on the node that associate multiple prefixes with the same namespace. If the argument node-set is empty or the first node has no expanded name, an empty string is returned. If the argument it omitted, it defaults to a node-set with the context node as its only member.