[graph35_on_article
     [any article (^$(no inheritance)$^),
          may have for Coverage: a thing,
          may have for title: a string,
          may be object of: a publishing,
          result of: a writing,
          authoring_date: a time_measure,
          may have for author: several person,
          may have for Creator: a string,
          may be part of: a book,
          may be in_proceedings of: a conference,
          descr of: a situation,
          may have for Source: a document_element,
          may have for url: a URL]
];