code: def createAppendElement(self, namespaceURI, localName, prefix=None):
          '''Create a new element (namespaceURI,name), append it
             to current node, and return the newly created node.
          Keyword arguments:
              namespaceURI -- namespace of element to create
              localName -- local name of new element
              prefix -- if namespaceURI is not defined, declare prefix.  defaults
                  to 'ns1' if left unspecified.
          '''
          declare = False
          qualifiedName = localName
          if namespaceURI:
              try:
                  prefix = self.getPrefix(namespaceURI)
              except:
                  declare = True
                  prefix = prefix or self._getUniquePrefix()
              if prefix: 
                  qualifiedName = '%s:%s' %(prefix, localName)
          node = self.createElementNS(namespaceURI, qualifiedName)
          if declare:
              node._setAttributeNS(XMLNS.BASE, 'xmlns:%s' %prefix, namespaceURI)
          self._appendChild(node=node._getNode())
          return nodf createAppendElement(self, namespaceURI, localName, prefix=None):
          '''Create a new element (namespaceURI,name), append it
             to current node, and return the newly created node.
          Keyword arguments:
              namespaceURI -- namespace of element to create
              localName -- local name of new element
              prefix -- if namespaceURI is not defined, declare prefix.  defaults
                  to 'ns1' if left unspecified.
          '''
          declare = False
          qualifiedName = localName
          if namespaceURI:
              try:
                  prefix = self.getPrefix(namespaceURI)
              except:
                  declare = True
                  prefix = prefix or self._getUniquePrefix()
              if prefix: 
                  qualifiedName = '%s:%s' %(prefix, localName)
          node = self.createElementNS(namespaceURI, qualifiedName)
          if declare:
              node._setAttributeNS(XMLNS.BASE, 'xmlns:%s' %prefix, namespaceURI)
          self._appendChild(node=node._getNode())
          return node
docs: Create a new element (namespaceURI,name), append it
             to current node, and return the newly created node.
          Keyword arguments:
              namespaceURI -- namespace of element to create
              localName -- local name of new element
              prefix -- if namespaceURI is not defined, declare prefix.  defaults
                  to 'ns1' if left unspecified.