Relation pm#agent__doer (pm#situation [48..*],pm#entity [49..*])
  supertype:  pm#doer/object/result  pm#who_relation
  subtype:  pm#organizer (pm#situation,pm#causal_entity)
  subtype:  pm#participant (pm#situation,pm#causal_entity)
  subtype:  pm#seller__vendor___vender (pm#situation -> pm#goal_directed_agent)
  subtype:  pm#customer__client___buyer__buyer___purchaser__purchaser___vendee (pm#situation,pm#goal_directed_agent)
  subtype:  pm#responsible_agent__responsibleagent (pm#situation,pm#causal_entity)
  subtype:  sumo#agent (sumo#process,dl#agentive_physical_object)  the 2nd argument is an active determinant, animate or inanimate, of the process