pm#identifier__id
  supertype:  pm#social_attribute_or_quality_or_measure
  subtype:  pm#passport_identifier
  subtype:  pm#social_welfare_identifier
  subtype:  pm#serial_number
  subtype:  pm#URI__Uniform_Ressource_Identifier
     subtype:  pm#URL__Uniform_Ressource_Locator
     subtype:  pm#URN__Uniform_Ressource_Number

14 statements are about indirect instances of pm#identifier: pm#graph1_on_thing, pm#graph1_on_collection, pm#graph1_on_creation_result, pm#graph1_on_situation, pm#graph1_on_conference, pm#graph1_on_description, pm#graph1_on_description_container, pm#graph1_on_description_medium, pm#graph1_on_file, pm#graph1_on_written_material, pm#graph1_on_publication, pm#graph1_on_report, pm#graph35_on_article, pm#graph1_on_ontology
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