[1] Extensible Markup Language (XML) 1.1 (Second Edition) ( (9/29/2006, 10:02:09 AM 版)) <http://www.w3.org/TR/2006/REC-xml11-20060816/#sec-CharNorm>

[2] Character Model for the World Wide Web 1.0: Fundamentals ( (2/15/2005, 5:24:00 AM 版)) <http://www.w3.org/TR/charmod/#Unicode_Encoding_Form>