I am a newbie of Tapestry.
  
  I looked up the API of StringValidator.
  
  It says:
  
    Simple validation of strings, to enforce required, and minimum length    
(maximum length is enforced in the client browser, by setting a maximum input   
 length on the text field).
  
  What if the string is a non single byte string? 
  For example a Chinese UTF8 string which takes 3 bytes.
  We can use maxlength in input object to limit string length.
  It causes problems when it is inserted into database.
  
  Do we have a validator which can check the max length in bytes of a string?
  
  Thanks.
  
  
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