has been providing ontology search and visualisation services for over ten years. In this time
the range and diversity of ontologies has changed dramatically. One of the major shifts has
been the increasing use of the W3C Web Ontology Language (OWL) for representing
biomedical ontologies. The OLS has been reengineered in order to accommodate the OWL
standard and provide a wider range of ontology-based services to the community.