The OBO Relation Ontology provides consistent and unambiguous formal definitions of the relational expressions used in biomedical ontologies.

Preferred Prefix
Alternative Prefixes
obo_rel oborel RO_proposed_relation
life science obo ontology relations
Homepage Repository OBO OWL OBO JSON
Chris Mungall   0000-0002-6601-2165   cmungall
Pattern for Local Unique Identifiers

Local identifiers in Relation Ontology should match this regular expression:

Example Local Unique Identifiers
0002533   Resolve
HOM0000022   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from Relation Ontology should match this regular expression:

Example CURIEs
MIRIAM Namespace Embedded in LUI
The legacy MIRIAM standard for generating CURIEs with this resource annotates the namespaceEmbeddedInLUI as true. This means that you may see local unique identifiers that include a redundant prefix and delimiter (also known as a banana) and therefore look like a CURIE. For Relation Ontology, the banana looks like RO_. Therefore, you may see local unique identifiers for this resource that look like RO_0002533 (instead of the canonical form 0002533) and CURIEs for this resource that look like RO:RO_0002533 (instead of the canonical form RO:0002533). The Bioregistry will automatically strip off the banana when standardizing local unique identifiers and CURIEs.
Metaregistry Relation Ontology

The metaregistry provides mappings between the Bioregistry and other registries. There are 14 mappings to external registries for this resource with 4 unique external prefixes.

Registry Name Registry Metaprefix External Prefix Curate
AberOWL AberOWL logo aberowl RO
AgroPortal AgroPortal logo agroportal RO
BioContext biocontext RO
Biolink Biolink Model Registry logo biolink RO
BioPortal BioPortal Prefixes logo bioportal OBOREL
FAIRSharing FAIRSharing logo fairsharing FAIRsharing.9w8ea0
GO Gene Ontology Registry logo go RO logo miriam ro
N2T Name-to-Thing logo n2t ro
OBO Foundry OBO Foundry logo obofoundry ro
OLS Ontology Lookup Service logo ols ro
OntoBee OntoBee logo ontobee RO
Prefix Commons Prefix Commons logo prefixcommons ro
Wikidata Wikidata Property logo wikidata P3590
RDF Information

When using this resource in RDF, the following URI format should be used:$1


A provider turns a local unique identifiers from a resource into a URI. Many providers are also resolvable as URLs (i.e., they can be used in a web browser).

The local unique identifier 0002533 is used to demonstrate the providers available for Relation Ontology. A guide for curating additional providers can be found here.

Name Metaprefix URI
Relation Ontology ro
Relation Ontology (RDF) rdf
Bioregistry bioregistry miriam
OBO Foundry obofoundry
Ontology Lookup Service ols
Name-to-Thing n2t
BioPortal Prefixes bioportal
Extra Providers

Additional providers curated in the Bioregistry are listed here. These are typically inherited from or Prefix Commons, and need extra curation.

Code Name URL
bio2rdf Bio2RDF