Ontology of standardized units

Preferred Prefix
life science mathematics measurement obo ontology unit
Homepage Repository OBO OWL
George Gkoutos   0000-0002-2061-091X   gkoutos
Pattern for Local Unique Identifiers

Local identifiers in Units of measurement ontology should match this regular expression:

Example Local Unique Identifier
0000080   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from Units of measurement ontology should match this regular expression:

Example CURIE
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 Units of measurement ontology, the banana looks like UO:. Therefore, you may see local unique identifiers for this resource that look like UO:0000080 (instead of the canonical form 0000080) and CURIEs for this resource that look like UO:UO:0000080 (instead of the canonical form UO:0000080). The Bioregistry will automatically strip off the banana when standardizing local unique identifiers and CURIEs.
2012 The Units Ontology: a tool for integrating units of measurement in science

A summary of the relations in the Bioregistry schema can be found here.

Appears In (4) (bioregistry.schema:0000018 )
Metaregistry Units of measurement ontology

The metaregistry provides mappings between the Bioregistry and other registries. There are 11 mappings to external registries for this resource with 2 unique external prefixes.

Registry Name Registry Metaprefix External Prefix Curate
AberOWL AberOWL logo aberowl UO
AgroPortal AgroPortal logo agroportal UO
BioContext biocontext UO
BioPortal BioPortal Prefixes logo bioportal UO
FAIRSharing FAIRSharing logo fairsharing FAIRsharing.mjnypw
Identifiers.org Identifiers.org logo miriam uo
N2T Name-to-Thing logo n2t uo
OBO Foundry OBO Foundry logo obofoundry uo
OLS Ontology Lookup Service logo ols uo
OntoBee OntoBee logo ontobee UO
Prefix Commons Prefix Commons logo prefixcommons uo
RDF Information

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



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 0000080 is used to demonstrate the providers available for Units of measurement ontology. A guide for curating additional providers can be found here.

Name Metaprefix URI
Units of measurement ontology uo http://purl.obolibrary.org/obo/UO_0000080
Units of measurement ontology (RDF) rdf http://purl.obolibrary.org/obo/UO_0000080
Bioregistry bioregistry https://bioregistry.io/uo:0000080
Identifiers.org miriam https://identifiers.org/UO:0000080
OBO Foundry obofoundry http://purl.obolibrary.org/obo/UO_0000080
Ontology Lookup Service ols https://www.ebi.ac.uk/ols4/ontologies/uo/terms?iri=http://purl.obolibrary.org/obo/UO_0000080
Name-to-Thing n2t https://n2t.net/uo:0000080
BioPortal Prefixes bioportal https://bioportal.bioontology.org/ontologies/UO/?p=classes&conceptid=http://purl.obolibrary.org/obo/UO_0000080
Extra Providers

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

Code Name URL
bio2rdf Bio2RDF http://bio2rdf.org/uo:0000080