p3p#User.cert.format__user__format  certificate format
  supertype:  p3p#UnstructuredDataElement  A data element with no component parts
     supertype:  p3p#DataElement  A specific item of data a service might collect
        supertype:  pm#P3P_thing
           supertype:  pm#thing_categorized_in_an_ontology
              supertype:  pm#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
  supertype:  p3p#Category-uniqueid__unique_id  Non-financial identifiers, excluding government-issued identifiers, issued for purposes of consistently identifying or recognizing the individual
     supertype:  p3p#Category
        supertype:  pm#P3P_thing

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