[xml] how to recognize Chinese?

[<lxl0621 vip sina com>]

when i signatured a xml file containing DTD file,it will fail if the DTD file contains Chinese . So I 
consider that the signature cannot recognise a Chinese DTD file so that the signature cannot process the 
Chinese xml file.For example: 
 <!ELEMENT books (#PCDATA|Ãû×Ö|writer> 
 <!ELEMENT Ãû×Ö (#PCDATA)> 
 <!ELEMENT writer (#PCDATA)> 
 I asked for help .How to process DTD including Chinese word. 
 Can you help me resolve this problem? Please answer me as possible as quickly .Thank you 


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