Relation rst#elaboration (pm#description_content/medium/container,pm#description_content/medium/container)  e.g., rst#subtype rst#property, rst#part
  exclusion:  rst#circumstance  rst#solution  rst#cause  rst#effect  rst#definition  rst#comparison  rst#means  rst#condition  rst#otherwise  rst#interpretation  rst#restatement  rst#summary  rst#theme  rst#contrast
  subtype: {rst#subtype rst#instance rst#illustration rst#attributive_relation rst#part rst#subtask rst#specialization}
  supertype:  rst#subject_matter_rhetorical_relation (pm#description_content/medium/container,pm#description_content/medium/container)  connect to details for making a better description
     supertype:  pm#rhetorical_relation (pm#description_content/medium/container,pm#description_content/medium/container)  main sources: the Rhetorical Structure Theory (RST) and the PENMAN ontology; DO NOT USE such fuzzy relations: instead, use relations from/to situations!
        supertype:  pm#relation_from_description_content/medium/container (pm#description_content/medium/container,*)
           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