Relation rst#symmetric_rhetorical_relation (description_content/medium/container,description_content/medium/container)  e.g., rst#restatement
  supertype:  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:  restatement (description_content/medium/container,description_content/medium/container)
  subtype:  contrast (description_content/medium/container,description_content/medium/container)  comparability and differences of two situations
     subtype:  antithesis (description_content/medium/container,description_content/medium/container)