Relation p3p#optionalData (p3p#Statement,p3p#DataElement)  the data to be optionaly transferred or inferred
  supertype:  p3p#data (p3p#Statement,p3p#DataElement)  the data to be transferred or inferred
     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


Simple category search: