| http://www.w3.org/ns/prov#value | - Description of the Related Art [0004] A retrieval engine for a document processed through a network such as Intranet, WWW, etc. is realized by a document collection apparatus (robot, spider or crawler) for collecting documents from a network, and a retrieval engine for generating a keyword index for collected documents. [0005] The document collection apparatus repeats processes of starting collect
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