Relation rst#subtask (pm#description_content/medium/container,pm#description_content/medium/container)
  exclusion:  rst#subtype  rst#instance  rst#illustration  rst#attributive_relation  rst#part  rst#specialization
  supertype:  rst#elaboration (pm#description_content/medium/container,pm#description_content/medium/container)  e.g., rst#subtype rst#property, rst#part
     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