Are the URN's used anywhere yet? If so, there should probably be discussion on the names cnxfolder/module/user/blob.

I'm interested in what the links look like `<a href="urn:cnxfolder:52..."></a>` in the module HTML (it will probably choke on colons thinking it is a protocol) as well as what the filename in the EPUB would be (filenames don't like to have colons in them)