1. Introduction: against fantology; 2. A very short history of formal ontology; 3. Contemporary formal ontology; 4. Our metatheory of formal ontology; 5. What can we do with our metatheory?; 6. Conclusion; References.

This Element shows different accounts of ontological forms in literature. It shows a character-neutral relational account and shows metatheory is useful for understanding categorial fundamentality/non-fundamentality, different formal ontologies, and unifying metaphysical questions. This title is also available as Open Access on Cambridge Core.