Fig. 1.
Root classes (super-classes) of STO as represented in the Protégé ontology editor software (a free, open-source ontology editor and framework for building intelligent systems, available from https://protege.stanford.edu/). Eight root classes describing the stroke knowledge domain suggested by experts. Also, subclasses of “Stroke type” are presented, which are categorized as “Intracranial hemorrhage” and “Ischemic stroke”. Musen and Protégé [26]