Taxonomic Tree of GFO
GFO (General Formal ontology) draws a fundamental distinction between concrete entities, categories and sets. Sets are described by an axiomatic fragment of set theory of Zermelo-Fraenkel, although fragments of anti-foundation axiom set theories such as ZF-AFA are considered.
Concrete entities are entities which are in time and space, while categories have universal character.
Read more about this topic: General Formal Ontology
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“Everyone who enjoys supposes that the tree was concerned with the fruit, but it was really concerned with the seed.—In this lies the difference between all those who create and those who enjoy.”
—Friedrich Nietzsche (1844–1900)