http://www.wikipedia.com/?source=asdf

All of these URLs point to the homepage of Wikipedia, but a search engine will only consider one of them to be the canonical form of the URL.

XML

A Canonical XML document is by definition an XML document that is in XML Canonical form, defined by . Briefly, canonicalization removes whitespace within tags, uses particular character encodings, sorts namespace references and eliminates redundant ones, removes XML and DOCTYPE declarations,

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