p3p#ExtOptional__optional  A P3P processor is not required to understand the value of the rdf:valueof property of resources of this type.
  exclusion:  p3p#ExtMandatory
  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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