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Appendix C.3 of the XQuery document states that the default value of the "omit- xml-declaration" serialization parameter is "yes". This means that an implementation is not allowed to provide an XML declaration in serialized output unless explicitly requested to do so. Providing an XML declaration is good practice, especially if an encoding other than UTF-8 or UTF-16 is used. The default value of this parameter should be changed to "implementation- defined". This change will be consistent with several other serialization parameters, and will allow each implementation to define its own policy with respect to XML declarations.
This suggestion was accepted and implemented by the Query working group on May 4, 2005.