3.5.3 Multiple kinds of characters

• Pronunciation of Japanese name can be written in either Hiragana or Katakana characters because both are phonograms: 'あ' and 'ア'
• Digits can be expressed in an ASCII (single byte) character, '1', or a Fullwidth (double bytes) character, '１'.
• This kind of ambiguity may cause problems when a user enters pronunciation of his name or some numerals in a form when a script that processes inputted text can not treat all possible input character types.

3.5.4 Notation of time and date

• "2005/07/19" is ambiguous format.
• Many Japanese screen readers do not notice this data as date but combination of figures and slash characters.

3.5.5 Obscure Japanese symbol characters

• Japanese has a lot of symbols: ☆, ★, ※, ＊
• These Japanese symbols are ideograms and their meaning is obscure.