RO is a collection of relations intended primarily for standardization across ontologies in the OBO Foundry and wider OBO library. It incorporates ROCore upper-level relations such as part of as well as biology-specific relationship types such as develops from.

See the site Menu for more info


Use the following URIs to download this ontology:

  • http://purl.obolibrary.org/obo/ro.owl
  • http://purl.obolibrary.org/obo/ro.obo

Note that the source ontology is OWL - the OBO version may have less axioms. Another difference between the two formats is that the OWL makes use of imports, whereas everything is combined into one with the obo file.


ro.owl Relation Ontology Canonical edition
ro.obo Relation Ontology in obo format Has imports merged in
ro/core.owl RO Core relations Minimal subset intended to work with BFO-classes [page]
ro/ro-base.owl RO base ontology Axioms defined within RO and to be used in imports for other ontologies [page]
ro/subsets/ro-interaction.owl Interaction relations For use in ecology and environmental science
ro/subsets/ro-eco.owl Ecology subset
ro/subsets/ro-neuro.owl Neuroscience subset For use in neuroscience [page]

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