Normalization Based On URL Lists
Some normalization rules may be developed for specific websites by examining URL lists obtained from previous crawls or web server logs. For example, if the URL
http://foo.org/story?id=xyz
appears in a crawl log several times along with
http://foo.org/story_xyz
we may assume that the two URLs are equivalent and can be normalized to one of the URL forms.
Schonfeld et al. (2006) present a heuristic called DustBuster for detecting DUST (different URLs with similar text) rules that can be applied to URL lists. They showed that once the correct DUST rules were found and applied with a canonicalization algorithm, they were able to find up to 68% of the redundant URLs in a URL list.
Read more about this topic: URL Normalization
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