Right from the beginning of search engine optimization, you might have heard the relevance of anchor text in page ranking. Recently Yahoo obtained the patent that describes the relevance of this anchor text. The patent is relatively old and dates back to 2002, but it has some relevant information on using of anchor text. This patent describes the method adopted by search engines in using the anchor text for indexing.
This clearly explains the information on how pages will be ranked by search engines for anchor texts which are not directly present in their content, but rather are present in the links which refer to these pages. The process used is a simple breaking up of the anchor text into tokens after they are collected from various pages pointing to the same page through links.
Then these tokens are given weights which are evaluated and the page which has the highest threshold weight will be considered for indexing by the search engine. The weight calculation is done by some simple formulas which determine the frequency of the token in the anchor text of the link pointing to the page. This also determines the frequency of the token in the search engine index.
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