Relation pm#owner_of__ownerof (causal_entity,?)
  exclusion:  attributive_relation  purpose  has-author  owned-by  owner  leader  seller  customer  generator  creator  spatial_origin  exploits  has_purpose  has_purpose_for_agent  measure  attribute  name  Date  value  rdf_reification_relation  support  example  syntax  has-magnitude
  supertype:  attributive_relation__attributiverelation  like pm#binary_relation, this type mostly exists to categorize what cannot be categorized elsewhere
  inverse:  owner
  equal:  have
  subtype:  possesses__possesse (agentive_physical_object,object)  the agent has ownership of the object
  subtype:  property_fn (agentive_physical_object -> set)  maps an agent to the set of objects owned by the agent