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Canonicalization is necessary due to the nature of XML and the way it is parsed by different processors and intermediaries, which can change the data in such a way that the signature is no longer valid but the signed data is still logically equivalent.Canonicalization eliminates these permissible syntactic variances by converting the XML to a canonical form before generating or validating the signature.

is the process of converting XML content to a physical representation, called the canonical form, in order to eliminate subtle changes that can invalidate a signature over that data.This allows you to develop a service provider implementation of the API.Service providers implement a specific XML mechanism that identifies the XML-parsing mechanism that the implementation uses.The example that this article will use is an enveloped XML signature generated over the contents of an XML document, a sample purchase order.The article will also use this sample in the subsequent sections on using the API.

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