Character classes , such as punctuation , are defined according to the Unicode Standard ( Aliprand et al. , 2004 ) .
the unicode standard
Joan Aliprand Julie Allen Joe Becker Mark Davis Michael Everson
Each punctuation symbol is considered a separate token . Character classes , such as punctuation , are defined according to the Unicode Standard ( Aliprand et al. , 2004 ) .
Character classes , such as punctuation , are defined according to the Unicode Standard ( @@CITATION ) .