code: def streams(self):
          
  
          if not self.get_objects_by_type('stream'):
              tpld_ids = []
              for index in self.get_attribute('ps_indices').split():
                  stream = XenaStream(parent=self, index='{}/{}'.format(self.index, index))
                  tpld_ids.append(stream.get_attribute('ps_tpldid'))
              if tpld_ids:
                  XenaStream.next_tpld_id = max([XenaStream.next_tpld_id] + [int(t) for t in tpld_ids]) + 1
          return {s.id: s for s in self.get_objects_by_type('stream')}
docs: :return: dictionary {id: object} of all streams.
          :rtype: dict of (int, xenamanager.xena_stream.XenaStream)