Relation pm#owner (?,pm#causal_entity)  this is not a function: 0..N owner allowed
  exclusion:  rst#attributive_relation  pm#purpose  aktp#has-author  aktp#owned-by  pm#owner_of  sumo#leader  pm#seller  pm#customer  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#attributive_relation  pm#who_relation
  inverse:  pm#owner_of
  subtype:  pm#sole_owner (? -> pm#causal_entity)