Hi !

What is the utility of abstract method if implementation can not follow the signature (constraints ?) of the abstract method ?
In this case, abstract methods are totaly useless !
Moreover, i think that it's not compatible with Liskov substitution principle (http://en.wikipedia.org/wiki/Liskov_substitution_principle).

Best regards,
Fred
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Frédéric Hardy : Architecte d'application/Admin. système/Ergonome
           CV : http://blog.mageekbox.net/public/cv.frederic.hardy.pdf
         Blog : http://blog.mageekbox.net
      Twitter : http://twitter.com/mageekguy
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