code: function (namespaceURI, qualifiedName, doctype) {
          return Node.createDocument({
              name: qualifiedName,
              namespaceURI: namespaceURI,
              doctype: doctype
          });
      }
docs: createDocument
  
  @param {string} namespaceURI namespace URI
  @param {string} qualifiedName qualified Name
  @param {string} doctype document type
  @return {Node}