Earlier this week we discussed on the SRFI 198 mailing list that there
should be a community-wide registry for foreign error types. The set of
known error types is necessarily evolving so it can't be in the SRFI. It
will surely be useful to define other evolving sets of things in future
SRFIs.

To that end, we should establish some kind of lightweight registry for
identifiers and other such things. Harold suggested, and Arthur and I
agreed, that it could be a Git repo + low-traffic mailing list.
Submissions could be via pull request / mailing list, quite informal.

Harold and I thought xxxxxx@srfi.schemers.org would be a fitting
name for the mailing list. The SRFI domain is currently by far the
easiest place for us to set up new Scheme mailing lists, and Arthur is
good at administering them.

The Git repo could be under

- https://github.com/scheme-requests-for-implementation
- https://github.com/srfi-explorations
- some other organization

We can make subdomains under scheme.org, so we could also set up a
simple static page at https://registry.scheme.org/