Ontology Xref Service
OxO (Ontology Xref Service) is a cross-ontology mapping service developed by EMBL-EBI's Samples, Phenotypes and Ontologies Team (SPOT). The service provides mappings between terms from different ontologies, enabling users to search for equivalent or related terms across multiple ontological resources. OxO aggregates cross-references from ontologies loaded in the Ontology Lookup Service (OLS) and enriches these with manual mappings and inference-based relationships.
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{"activity_status": "inactive", "category": "Aggregator", "contacts": [{"category": "Organization", "contact_details": [{"contact_type": "email", "value": "ols-support@ebi.ac.uk"}, {"contact_type": "github", "value": "EBISPOT"}], "id": "ebi", "label": "EMBL-EBI Samples, Phenotypes and Ontologies Team (SPOT)"}], "creation_date": "2025-11-04T00:00:00Z", "description": "OxO (Ontology Xref Service) is a cross-ontology mapping service developed by EMBL-EBI's Samples, Phenotypes and Ontologies Team (SPOT). The service provides mappings between terms from different ontologies, enabling users to search for equivalent or related terms across multiple ontological resources. OxO aggregates cross-references from ontologies loaded in the Ontology Lookup Service (OLS) and enriches these with manual mappings and inference-based relationships.", "domains": ["biomedical", "upper", "biological systems"], "homepage_url": "https://www.ebi.ac.uk/spot/oxo/", "id": "oxo", "infores_id": "oxo", "last_modified_date": "2025-11-04T00:00:00Z", "layout": "resource_detail", "name": "Ontology Xref Service", "products": [{"category": "ProgrammingInterface", "description": "RESTful API for programmatic access to cross-ontology mappings and term equivalence searches", "format": "http", "id": "oxo.api", "name": "OxO REST API", "original_source": ["oxo"], "product_url": "https://www.ebi.ac.uk/spot/oxo/docs/api"}, {"category": "GraphicalInterface", "description": "Web-based interface for searching and browsing ontology cross-references and mappings", "format": "http", "id": "oxo.portal", "name": "OxO Web Interface", "original_source": ["oxo"], "product_url": "https://www.ebi.ac.uk/spot/oxo/"}], "repository": "https://github.com/EBISPOT/OXO", "synonyms": ["OxO"]}