[plt-scheme] framing problem

It's a problem of modularity.  Do a search and you'll find a lot of
papers on it. IIRC PLT addressed the expression problem witha
combination of classes and units.

N.

On Thu, Feb 21, 2008 at 4:41 PM, Tom Schouten <tom at zzz.kotnet.org> wrote:
> hello,
>
>  i always wondered what this was about, so i thought i'd ask:
>
>  in the very first post on the PLT blog:
>  http://blog.plt-scheme.org/2007/05/macros-matter.html
>
>  there is the line:
>
>   ``we resurrected the "expression" problem''
>
>  anyone care to explain to the layman?
>
>  cheers,
>  tom