The Obstetric and Neonatal Ontology is a structured controlled vocabulary to provide a representation of the data from electronic health records (EHRs) involved in the care of the pregnant woman, and of her baby.

The development of OntONeo is following the OBO Foundry principles, which aims to develop a set of interoperable ontologies for representation of biological and biomedical reality.

We employed Basic Formal Ontology (BFO) version 2.0 as top-level ontology of OntONeo, which is a large acceptance and use in medical and biological domains.