OBO Interoperability Ontology
The OBO Interoperability Ontology (OIO) was a set of annotation properties and ontology metadata standards developed to promote interoperability between OBO Foundry ontologies. Its terms and properties have been superseded by OMO (Ontology Metadata Ontology) and are now considered deprecated. OIO provided foundational metadata terms that were widely used in early OBO ontologies for describing ontology versioning, imports, and other metadata.
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