docs: def get(self, aspect):
          """Get a network, system or configure or contextualize with the same id as aspect passed."""
  
          classification = [(network, self.networks), (system, self.systems),
                            (configure, self.configures)]
          aspect_list = [l for t, l in classification if isinstance(aspect, t)]
          assert len(aspect_list) == 1, "Unexpected aspect for RADL."
          aspect_list = aspect_list[0]
  
          old_aspect = [a for a in aspect_list if a.getId() == aspect.getId()]
          return old_aspect[0] if old_aspect else None