Relation rst#symmetric_rhetorical_relation (pm#description_content/medium/container,pm#description_content/medium/container)  e.g., rst#restatement
  supertype:  pm#rhetorical_relation (pm)  main sources: the Rhetorical Structure Theory (RST) and the PENMAN ontology; DO NOT USE such fuzzy relations: instead, use relations from/to situations!
  subtype:  rst#restatement (pm#description_content/medium/container,pm#description_content/medium/container)
  subtype:  rst#contrast (pm#description_content/medium/container,pm#description_content/medium/container)  comparability and differences of two situations
     subtype:  rst#antithesis (pm#description_content/medium/container,pm#description_content/medium/container)