Explain about XML canonicalization?

Often it happens that documents are identical in many different ways either logical or statistical. To eliminate this problem, you have to use canonicalization which helps people in identifying 2 similar documents with similar digital signature. Similar documents use canonicalization to identify similar pattern & signature.
The XML canonicalization technique is the calculation characterized by this particular that creates the authoritative type of a given XML archive or report subset. The term XML canonicalization alludes to the way toward applying the XML canonicalization strategy to a XML record or archive subset.