Relation pm#relation_to_situation (*,pm#situation)  in WebKB, prefer using relations "from" a situation
  exclusion:  pm#spatial_relation_to_entity_with_spatial_feature  pm#relation_to_time  pm#relation_to_collection  pm#relation_to_attribute_or_quality_or_measure
  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
  similar_to:  lis#participation  lis#involvement_by_reference
  subtype:  pm#relation_from_time_to_situation (pm#time_measure,pm#situation)
  subtype:  pm#relation_from_situation_to_situation (pm#situation,pm#situation)
     subtype:  pm#later_situation__latersituation (pm#situation,pm#situation)
        subtype:  pm#next_situation (pm#situation -> pm#situation)
           subtype:  pm#successor (pm#situation -> pm#situation)
        subtype:  pm#ending_situation__termination (pm#situation -> pm#situation)
        subtype:  pm#postcondition (pm#process,pm#situation)
        subtype:  pm#consequence (pm#situation,pm#situation)  see also rst#effect
     subtype:  pm#before_situation (pm#situation,pm#situation)  in WebKB, do not use these relations, use their inverses
        subtype:  pm#previous_situation (pm#situation -> pm#situation)
        subtype:  pm#beginning_situation__beginningsituation (pm#situation -> pm#situation)
        subtype:  pm#precondition (pm#process,pm#situation)
        subtype:  pm#cause (pm#situation,pm#situation)  see also rst#cause
           subtype:  sumo#causes (sumo#process,sumo#process)  the process in the 1st argument brings about the process in the 2nd argument