pm#URI__Uniform_Ressource_Identifier
  supertype:  identifier__id
  subtype:  URL__Uniform_Ressource_Locator
  subtype:  URN__Uniform_Ressource_Number

13 statements are about indirect instances of URI: graph1_on_thing, graph1_on_collection, graph1_on_situation, graph1_on_conference, graph1_on_description, graph1_on_description_container, graph1_on_description_medium, graph1_on_file, graph1_on_written_material, graph1_on_publication, graph1_on_report, graph35_on_article, graph1_on_ontology
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