Scheme Request for Implementation 159,
"Combinator Formatting,"
by Alex Shinn,
has gone into "final" status.

The document and an archive of the discussion are available at <>.

Here's the abstract:

  A library of procedures for formatting Scheme
  objects to text in various ways, and for easily
  concatenating, composing and extending these
  formatters efficiently without resorting to
  capturing and manipulating intermediate strings.

There have been minor changes since the previous draft:


SRFI Editor