If you played the game Scribblenauts, its "database that contains literally every object imaginable" is (as best I can tell) probably a bespoke ontology. Everyt

If you played the game Scribblenauts, its "database that contains literally every object imaginable" is (as best I can tell) probably a bespoke ontology. Everything you try to stump it with references a factory of classes you can spawn instances of. The properties of a near-infinite number of classes need to be edited and managed somehow. Doing it in an IDE where every class is discrete is a pain in the ass. It's easier in a database- or filesystem-like interface. Hence, ontology editors.