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The last sentence in section 5 (XML Output Method) should be moved to section 5.1.10 (XML Output Method: the use-character-maps Parameter). The description of error err:SERE0003 provided in the beginning of section 5 already points out the same information though worded differently. "The result of serialization using the XML output method is not guaranteed to be well-formed XML if character maps have been specified (see 9 Character Maps)."
fixed.