code: def create_element(self, ns, name):
          
          elem = self._node.makeelement('{%s}%s' % (SLDNode._nsmap[ns], name), nsmap=SLDNode._nsmap)
          self._node.append(elem)
  
          return getattr(self, name)
docs: Create an element as a child of this SLDNode.
  
          @type    ns: string
          @param   ns: The namespace of the new element.
          @type  name: string
          @param name: The name of the new element.
          @rtype: L{SLDNode}
          @return: The wrapped node, in the parent's property class. This will
                   always be a descendent of SLDNode.