Construct a QName using a namespace URI and a lexical representation.
The lexical representation may be a local name on its own, or it may
be in the form prefix:local-name
Construct a QName from a lexical QName, supplying an element node whose in-scope namespaces are to be used to resolve any prefix contained in the QName.
public QName(string,XdmNode);
Construct a QName using a namespace URI and a lexical representation.
The lexical representation may be a local name on its own, or it may
be in the form prefix:local-name
public QName(string,string);
Construct a QName using a namespace prefix, a namespace URI, and a local name (in that order).
public QName(string,string,string);
Construct a QName from an XmlQualifiedName (as defined in the
System.Xml package).
public QName(XmlQualifiedName);