[graph1_on_situation
     [any situation (^$(no inheritance)$^),
          may have for relation_from_situation_to_time (^$(explore)$^): a time_measure,
          may have for relation_from_situation_to_situation (^$(explore)$^): a situation,
          may have for doer/object/result/place (^$(explore)$^): a thing,
          may have for experiencer: a person,
          may have for recipient: a person,
          may have for relation_from_situation (^$(explore)$^): a thing,
          may have for url: a URL]
];