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

Preferred Prefix
Alternative Prefixes
obo_rel RO_proposed_relation oborel
CC0 1.0
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 Identifier
0002533   Resolve
Pattern for CURIES

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

Example CURIE
MIRIAM Namespace Embedded in LUI
The legacy MIRIAM standard for generating CURIEs with this resource includes the namespaceEmbeddedInLUI as true. The actual part that gets prefixed before the local unique identifier regex, otherwise known as the banana, is RO_. Therefore, you might see local unique identifiers written out as CURIEs.
Metaregistry Relation Ontology

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

Registry Name Registry Metaprefix External Prefix Curate
AberOWL aberowl RO
AgroPortal agroportal RO
BioContext biocontext RO
Biolink Model Registry biolink RO
BioPortal Prefixes bioportal OBOREL
FAIRSharing FAIRSharing logo fairsharing FAIRsharing.cp0ybc
Gene Ontology Registry go RO logo miriam ro
Name-to-Thing Name-to-Thing logo n2t ro
OBO Foundry OBO Foundry logo obofoundry ro
Ontology Lookup Service Ontology Lookup Service logo ols ro
OntoBee ontobee RO
Prefix Commons prefixcommons ro
Wikidata Property Wikidata Property logo wikidata P3590

Providers are various services that resolve CURIEs to URLs. The example CURIE ro:0002533 is used to demonstrate the provides available for ro. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
Relation Ontology ro
Bioregistry bioregistry miriam
OBO Foundry obofoundry
Ontology Lookup Service ols
Name-to-Thing n2t
BioPortal Prefixes bioportal