On Mon, 08 Jan 2001  16:35:59 +0900, SZMURLO MAURICE wrote:
> Hi,
> 
> I was mainly thinking about abstract in the java sense:
> non-instatiable classes with methods that are to be 
> implemented in subclasses:

Have a look at
http://www.xs4all.nl/~hipster/lib/ruby/interface-abstract

	Michel