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