docs: def parse_xml_node(self, node):
          '''Parse an xml.dom Node object representing a component group into
          this object.
  
          '''
          self.group_id = node.getAttributeNS(RTS_NS, 'groupId')
          self._members = []
          for c in node.getElementsByTagNameNS(RTS_NS, 'Members'):
              self._members.append(TargetComponent().parse_xml_node(c))
          return self