"\n\t\tA classifier for keys.\n\t\tIn case of a \"clean cut\", instances of such events\n\t\tshould have one factor: the detected key (perhaps using the\n\t\tkey ontology at http://purl.org/NET/c4dm/keys.owl).\n\t\tIn other cases, we can put several keys as a factor, maybe with different confidence\n\t\tfactors, using event decomposition.\n\t\t" . . "Key event" . . . . . "testing" . .