The ontology selection and editing component. This component is made up of two panes. The left pane allows any branch of the MGED Ontology to be viewed as a tree. The relevant sub-branch of the ontology is displayed during annotation. Classes containing subclasses or instances can be clicked to open tree views of the contents. The right panel gives details on any class or instance that is selected. This includes a description taken from the MGED Ontology and a list of properties.