Relation p3p#optInstructions__optinstruction (p3p#Policy,p3p#OptInstructions)  A link to instructions that users can follow to request or
    decline to have their data used for a particular purpose.
  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


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