[plt-scheme] Copying bindings between namespaces

Timo Lilja wrote:

> I'm trying to write a safe sandbox to run untrusted code with
> MzScheme. The general idea is to have an empty namespace and copy
> certain bindings from MzScheme's normal namespace to it. I would leave
> all I/O-primitives and other unnecessary (and possibly dangerous)
> primitives out. 

Are you aware of the new module system in PLT 200 (whose head keyword
is `module')?  If for some reason you've rejected a solution based on
that, it would help to know why.

Shriram