[plt-scheme] patch to escape R6RS library names [was: SXML for R6RS]

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Tue Jul 8 09:40:58 EDT 2008

At Tue, 8 Jul 2008 07:34:44 -0600, Matthew Flatt wrote:
> That is, a `%' could be allowed
> in a `lib' module-path element, as long as its followed by two
> lowercase hexadecimal digits. [...] But if R6RS library names are mapped 
> to `lib' paths by UTF-8
> encoding followed by %-encoding of all "special" characters, then
> there's a 1-to-1 mapping (ignoring versioning and suffixes) between
> R6RS paths and `lib' paths.

One more detail: we'd have to constrain `%' escapes in `lib' path
elements to rule out encodings of the characters that are currently
allowed. For example, "%41" (= "A", when read as an encoding) would be


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