Relation pm#relation_to_another_ontology (ontology,ontology)
  supertype:  relation_from_an_ontology  relation_between_collections
  instance of:  ontology_property
  subtype:  backward_compatible_with (ontology,ontology)
  subtype:  incompatible_with (ontology,ontology)
  subtype:  prior_version__priorversion (ontology,ontology)