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4. Searching and Ranking > Using Inbound Links

Using Inbound Links

The scoring metrics discussed so far have all been based on the content of the page. Although many search engines still work this way, the results can often be improved by considering information that others have provided about the page, specifically, who has linked to the page and what they have said about it. This is particularly useful when indexing pages of dubious value or pages that might have been created by spammers, as these are less likely to be linked than pages with real content.

The crawler that you built at the beginning of the chapter already captures all the important information about the links, so there’s no need to change it. The links table has the URL IDs for the source and target of every link that it has encountered, and the linkwords table connects the words with the links.


  

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