Relation pm#customer__client___buyer__buyer___purchaser__purchaser___vendee (pm#situation,pm#goal_directed_agent)
  exclusion:  rst#attributive_relation  pm#purpose  aktp#has-author  aktp#owned-by  pm#owner  pm#owner_of  sumo#leader  pm#seller  pm#generator  pm#creator  pm#spatial_origin  sumo#exploits  sumo#has_purpose  sumo#has_purpose_for_agent  pm#measure  pm#attribute  pm#name  dc#Date  rdf#value  pm#rdf_reification_relation  pm#support  pm#example  pm#syntax  akts#has-magnitude
  supertype:  pm#agent__doer (pm#situation [48..*],pm#entity [49..*])
     supertype:  pm#doer/object/result (pm#situation,?)
        supertype:  pm#doer/object/result/place (pm#situation,?)
           supertype:  pm#case_relation__thematic_relation (pm#situation,*)
              supertype:  pm#relation_from_situation (pm#situation,*)
                 supertype:  pm#relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
                    >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
     supertype:  pm#who_relation__whorelation (*)
        supertype:  pm#wh-/how_relation (*)  this type permits to categorize relations according to the usual who/what/why/where/when/how questions ; this is a traditional but very subjective and ineffective way of categorizing relations 
           >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
  supertype:  pm#attributive_relation__attributiverelation (*)  like pm#binary_relation, this type mostly exists to categorize what cannot be categorized elsewhere
     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
        >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type