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