pm#string  a string of characters
  supertype:  array  content_bearing_object (sumo)  DigitalSubject
  equal:  symbolic_string (pm)  string (pm)
  subtype:  XML_literal
     subtype:  Literal
        subtype:  name_string
  subtype:  character  element of an alphabet, a set of numerals, etc.; sumo#character is a subclass of sumo#symbolic_string, because every instance of sumo#character is an alphanumeric sequence consisting of a single element

10 statements are about direct instances of string: graph1_on_conference, graph1_on_file, graph1_on_written_material, graph1_on_publication, graph1_on_report, graph35_on_article, graph1_on_address, graph1_on_housing, graph1_on_meal_shop, graph1_on_person
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