Hi Jun, As I told you at GGF17, the following is the text from OGSA WSRF BP 1.0. Good and bad canonicalization/serialization standards for XML doc.
Several specifications defining canonicalization/serialization algorithms have been developed: Canonical XML [XML-C14N], Exclusive XML Canonicalization [XML-Exc-C14N] and [SchemaCentric-XML-C14N]. The first two specifications have well known issues that make them unsuitable for serialization (except in the most limited of use cases). [SchemaCentric-XML-C14N] addresses these issues. For a complete discussion of the limitations of Canonical XML and Exclusive XML Canonicalization see [SchemaCentric-XML-C14N] section 1.1.
[SchemaCentric-XML-C14N] B. Atkinson, S. Aissi, M. Hondo (ed.), Schema Centric XML Canonicalization, OASIS Committee Specification, 10 July 2002. http://www.uddi.org/pubs/SchemaCentricCanonicalization-20020710.htm [XML-C14N] J. Boyer (ed.) Canonical XML W3C Recommendation, March 2001 http://www.w3.org/TR/2001/REC-xml-c14n-20010315 http://www.ietf.org/rfc/rfc3076.txt [XML-Exc-C14N] J. Boyer, D. Eastlake, and J. Reagle (ed.) Exclusive XML Canonicalization W3C Candidate Recommendation, 12 February 2002 http://www.w3.org/TR/2002/CR-xml-exc-c14n-20020212 -- Hiro Kishimoto