When hacking on CLIM applications, it often/always becomes necessary to define new presentation types - some of these are very specialized to the application, while others are very general concepts (such as URLs). Having to reimplement these presentation types in every application is pointless and impairs application integration (not very much right now, since McCLIM doesn't support input contexts across multiple frames).
Therefore, I propose the creation of a portable library of general-purpose presentation type definitions containing definitions of widely useful presentations such as `url' or `package', and whatever else is not too specialized to specific applications. I think this library should be bundled with McCLIM, yet not be dependent on the of McCLIM as the underlying CLIM implementation, because most users of free CLIM applications will be using McCLIM already, and bundling the library with McCLIM will free them from having to hunt down new dependencies.
What do you think?