Relation pm#doer/object/result/place (pm#situation,?)
  subtype:  pm#doer/object/result  pm#from/to  pm#place  pm#path_length
  type:  pm#case_relation_type  the class of predicates relating the spatially distinguished parts of a process. e.g., the agent, patient or destination of an action, the flammable substance in a burning process, or the water that falls in rain
  supertype:  pm#case_relation__thematic_relation (pm#situation,*)
     supertype:  pm#relation_from_situation (pm#situation,*)
        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
           >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type