Patent Document ID: 8510308
Application ID: 12816852

Base Claim:
1. A method performed by data processing apparatus, the method comprising: receiving a collection of text; identifying a first collection of instance-class pairs for the collection of text, wherein the first collection of instance-class pairs are identified by applying one or more template patterns to a collection of documents; clustering a collection of semantically similar phrases using the collection of text; determining, for each class in the first collection of instance-class pairs: whether a threshold number of instances within a cluster in the semantically similar phrase clusters are labeled by the class, and whether a threshold number of clusters in the semantically similar phrase clusters include at least one instance that is labeled by the class; in response to determining that a threshold number of instances within a cluster are labeled by a class and a threshold number of clusters in the semantically similar phrase clusters include at least one instance that is labeled by the class, selecting each instance in the first collection of instance-class pairs that are labeled by the class to be included in a second collection of instance-class pairs; and storing the second collection of instance-class pairs for use in information retrieval.

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Claim 2:
2. The method of claim 1 , where the threshold number of instances is a minimum number of instances paired with the class found within the cluster.