The original wording of this principle (given below) and content of this page is scheduled to be reviewed. Improved wording will be posted as it becomes available.
The original formulation of this principle requires some modifications. The pattern laid down in the RO paper does not make sense for OBO and OWL ontologies, which use instance level relations, not type level relations. See this thread.
- original principle, modified
The ontology uses relations which are unambiguously defined following the pattern of definitions laid down in the OBO Relation Ontology.