IMHO, it's important to be able to extract the metadata without running the module, for several reasons: security, speed, interoperablity. The last requires some explanitaion: if a module is only designed to work from Win32, it should be possible to detect that from the given metadata easily, without having to code around it.
This is, of course, in direct conflict with having modules be able to determine their own metadata dynamicly. I'm inclined to sacrifice that completly, but most people don't seem to see it that way.
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