Description: Uniform Resource Locator (URL) address discrimination is the way web pages, but also the way spiders crawl the website pages of information. That is how the search engine spiders to crawl web pages by URL link it? Search engines work is broadly divided into three stages: crawling and crawling stage (search engine spiders to access the page, and the page html code to get into the database): pretreatment (on page text extraction, segmentation, eliminate noise, and to re-establish index) ranking (based on the correlation of the page and site level weights presented to the user).
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