[1] [CITE@en[Character Model for the World Wide Web 1.0: Normalization]]
( ([TIME[2012-04-27 11:15:23 +09:00]] 版))
<http://www.w3.org/TR/charmod-norm/#d0e854>

[2] [CITE@en[Extensible Markup Language (XML) 1.1 (Second Edition)]]
( ([TIME[2006-09-29 19:02:09 +09:00]] 版))
<http://www.w3.org/TR/2006/REC-xml11-20060816/#sec-CharNorm>