p3p#RetentionPolicy  A retention policy
  subtype:  Retention-no-retention  Retention-stated-purpose  Retention-legal-requirement  Retention-business-practices  Retention-indefinitely
  supertype:  P3P_thing
     supertype:  thing_categorized_in_an_ontology
        supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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