code: def list_percelen_by_sectie(self, sectie):
          '''
          List all percelen in a `sectie`.
          :param sectie: The :class:`Sectie` for which the percelen are wanted.
          :param integer sort: Field to sort on.
          :rtype: A :class:`list` of :class:`Perceel`.
          '''
          sid = sectie.id
          aid = sectie.afdeling.id
          gid = sectie.afdeling.gemeente.id
          sectie.clear_gateway()
          def creator():
              url = self.base_url + '/municipality/%s/department/%s/section/%s/parcel' % (gid, aid, sid)
              h = self.base_headers
              p = {
                  'data': 'adp'
              }
              res = capakey_rest_gateway_request(url, h, p).json()
              return [
                  Perceel(
                      r['perceelnummer'],
                      sectie,
                      r['capakey'],
                      self.parse_percid(r['capakey']),
                  ) for r in res['parcels']
              ]
          if self.caches['short'].is_configured:
              key = 'list_percelen_by_sectie_rest
              percelen = self.caches['short'].get_or_create(key, creator)
          else:
              percelen = creator()
          for p in percelen:
              p.set_gateway(self)
          return percelen