Relation p3p#extMandatory__extmandatory__mandatory (?,?) A p3p processor is required to understand the value of
the only property of the value of this property.
supertype: pm#P3P_relation (?,?)
supertype: pm#relation_coming_from_an_ontology (*)
supertype: pm#relation_for_an_application (*) relation introduced by an application
supertype: pm#relation_playing_a_special_role (*) this type permits to categorize relations according to their roles ; this is a traditional but quite subjective way of categorizing relations
supertype: pm#relation__related_thing__relatedthing___related_with (*) type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type