[graph1_on_description
     [any description (^$(no inheritance)$^),
          descr of: a thing,
          descr_container: a description_container,
          may have for url: a URL,
          description_instrument: a description_medium,
          may have for language: a description_medium,
          may have for format: a data_format,
          author: 1 causal_entity,
          authoring_date: a time_measure,
          may have for proof: a description,
          may have for example: a description,
          may have for Contributor: a entity,
          may have for Source: a entity,
          may have for url: a URL,
          may have for relation_from_description (^$(explore)$^): a thing]
];