... after the first iteration, itis difficult to distinguish the quality of extractionpatterns based, for instance, only on the percent-age of the seed set that they extract. The secondreason is the ... each other if theircomponents are present in an external hand-builtontology (i.e., WordNet), and the similarity among the components is high over the ontology. Sincegeneral-purpose ontologies, ... separately for the beginning of the first (left) and end of the sec-ond (right) phrases of the candidate fact. For gen-erality, the computation relies only on the part-of-speech tags of the current...