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Abstract:
We present YAGO2, an extension of the YAGO knowledge base, in which entities,
facts, and events are anchored in both time and space. YAGO2 is built
automatically from Wikipedia, GeoNames, and WordNet. It contains 447 million
facts about 9.8 million entities. Human evaluation confirmed an accuracy of 95
of the facts in YAGO2. In this paper, we present the extraction methodology and
the integration of the spatio-temporal dimension.