YAGO is an automatically generated ontology out of Wikipedia
and WordNet. It is eventually represented in a proprietary
flat text file format and a core comprises 10 million facts
and formulas. We present a translation of YAGO into the
Bernays-Sch¨onfinkel Horn class with equality. A new
variant of the superposition calculus is sound, complete
and terminating for this class. Together with extended term
indexing data structures the new calculus is implemented in
Spass-YAGO. YAGO can be finitely saturated by Spass-YAGO in
about 1 hour.We have found 49 inconsistencies in the original
generated ontology which we have fixed. Spass-YAGO can then
prove non-trivial conjectures with respect to the resulting
saturated and consistent clause set of about 1.4 GB in less
than one second
