> Yes. Another good example is python. jython is another implementation of
> the same language and should be interchangeable with the C implementation.
> This is where virtual packages make sense.

  I don't think that this is a safe assumption either. Jython is some
versions behind the official Python C implementation, and the language
has changed quite a bit from the version 2.1 to 2.4... Also, there are
some differences even between the same version of Jython and the C
Python, for more information look here:

  http://jython.sourceforge.net/docs/differences.html

  So, maybe that some programs uses some newest language features that
aren't present in Jython. Maybe also that, since Jython allows the
programmer to use the Java libraries, some programs needs specifically
Jython to work. Anyway, the whole point is that a a virtual package for
Python would make sense only apparently.

Paolo



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