docs: def _rpc(self, get, child=None, **kwargs):
          """
          This allows you to construct an arbitrary RPC call to retreive common stuff. For example:
          Configuration:  get: "<get-configuration/>"
          Interface information:  get: "<get-interface-information/>"
          A particular interfacece information:
                get: "<get-interface-information/>"
                child: "<interface-name>ge-0/0/0</interface-name>"
          """
          rpc = etree.fromstring(get)
  
          if child:
              rpc.append(etree.fromstring(child))
  
          response = self.device.execute(rpc)
          return etree.tostring(response)