=知识库=
[http://wiki.dbpedia.org/ dpedia]
[http://www.mpi-inf.mpg.de/departments/databases-and-information-systems/research/yago-naga/yago/ YAGO3]
[http://wordnet.princeton.edu/ WordNet]
[http://www.geonames.org/ GeoNames]
[http://BabelNet.org BabelNet]
[http://virtuoso.openlinksw.com/ Virtuoso Universal Server]