An updated version of SRFI-57 will soon be available on the site.  I have
made the following changes:

  * The syntax is now backwards compatible with SRFI-9, and
    supports new useful variations.
  * I have cleaned up the specification a bit, and added
    some more explanation and rationale.
  * Some operations have been renamed, e.g. update is now
    record-update.
  * The reference implementation has been simplified somewhat.
  * I have dropped pattern matching.  A separate SRFI on this
    will hopefully follow soon.
  * I have dropped introspection/generic operations on records.
    While I realize that this is useful, and have received some
    very good suggestions both online and privately, I think the
    design space is too large to come to a reasonable consensus
    in a reasonable time.  I would invite anyone who is interested
    to submit a separate SRFI for this later...

Regards
Andre