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In this paper the Gray Tunneling is defined and content block algorithm is used to enhance focused crawler’s ability of traversing Gray Tunneling. Gray Tunneling resolves the problem that the topicmultiplicity of a web page makes the relevance of the highly relevant page to be weakened. So during the process of crawling, in order to avoid the effect caused by the web page that is irrelevant to the specific topic as a whole but relevant partially, we divide a multitopical page into several blocks and process the blocks individually, and then we can traverse the page that is irrelevant as a whole to expand the scope crawler reached and get more relevant pages. A comprehensive experiment has been conducted, the result shows obviously that this approach outperforms Best-First and Breadth-First algorithm both in harvest rate and efficiency.

Gray Tunneling Based On Block Relevance for Focused Crawling