p3p#Expiry  States how long the policy reference file (or policies) remains valid.
  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

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