[plt-scheme] XML schema equivalent but for scheme s-expressions

On Sat, Oct 25, 2008 at 9:33 AM, Jay McCarthy <jay.mccarthy at gmail.com> wrote:
> Third, sometimes when I want to do this sort of thing, I make the
> configuration a program that returns a configuration object of my
> program. Then, PLT Scheme does the work of parsing and validating,
> etc. But this is not "safe".

Is it safe if you evalaute it within a limited namespace?