 The structure of BFO is based on a division of entities into two disjoint categories of "continuant" and "occurrent", the former comprehending for example objects and spatial regions, the latter comprehending processes conceived as extended through (or as spanning) time.BFO thereby seeks to consolidate both time and space within a single framework.BFO has been adopted as a foundational ontology by over 300 ontology projects, principally in the areas of biomedical ontology and security and defense (intelligence) ontology.