Fig. 1
From: The use of foundational ontologies in biomedical research
de Almeida Falbo et al.’s view of ontological levels as a continuum. Ontologies that define more general concepts of the world (e.g., foundational ontologies) are placed more to the left, while domain specific ones are placed more to the right. In the examples, BFO is defined in the leftmost side, while Biotop is depicted as more specific than BFO, but still more general than domain ones, such as ORDO. The positioning of SIO, Biotop, GO, ORDO and the EJP RD CDE Semantic Model are examples suggested by the authors of this paper