An update has been posted to the SRFI document - unfortunately it
is already a little out of date and the latest version can be
read at

 http://www.het.brown.edu/people/andre/macros/srfi-72.html

until the editor has had a chance to update the official page again.

Updates are:

  - SYNTAX-CASE is now included in the base specification.
  - The macro transformer calling convention has been changed for
    compatibility with SYNTAX-CASE.
  - The mechanism for avoiding variable capture in procedural macros
    has been much improved and integrated with the QUASISYNTAX and
    SYNTAX-CASE forms.
  - QUASISYNTAX is fully integrated with SYNTAX-CASE.
  - I have changed the wording defining syntax objects to include
    (possibly cyclic) graphs in an attemp to address Per Bothner's
    concern raised in this list.  The reference implementation does
    not handle cyclic syntac objects yet, though.

Andre