| http://www.w3.org/ns/prov#value | - nd the word extracting means and for generating a data vectors from the data; vector retrieving means for determining a semantic similarity of each of the data vectors to the request-text vector; key-word retrieving means for searching the data including a word being common to that included in the request-text by using the word extracting means; and extended retrieving means for retrieving data ad
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