| http://www.w3.org/ns/prov#value | - Each small piece of text within the documents such as a sentence, phrase and semantic unit in the data base is treated as...http://www.google.com/patents/US5642502?utm_source=gb-gplus-sharePatent US5642502 - Method and system for searching for relevant documents from a text database collection, using statistical ranking, relevancy feedback and small pieces of textAdvanced Patent SearchPublication
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