[pm#graph1_on_written_material
     [any #written_material (^$(no inheritance)$^),
          may have for dc#Coverage: a pm#thing,
          may have for pm#title: a pm#string,
          may be pm#object of: a #publishing,
          pm#result of: a #writing,
          pm#authoring_date: a pm#time_measure,
          may have for pm#author: a #person,
          may have for dc#Creator: a pm#string,
          may be pm#part of: a #book,
          pm#descr of: a pm#situation,
          may have for dc#Source: a pm#document_element,
          may have for pm#url: a pm#URL]
];