An updated version of the draft is available for comment.

Changes since the previous version are minor and mostly amount to
cleaning up and simplifying the specification and interface:

 * REFLECTIVE TOWER: Expanded explanation.

 * EXPANSION ORDER : Added specification of this, which matters
                     in a procedural macro system.

 * EMBEDDED-SYNTAX : Removed. Unnecessary (can be written as a macro).
 * SYNTAX-DEBUG    : Removed. Unnecessary.
 * SYNTACTIC-WIND  : Removed. Replaced by:
 * AROUND-SYNTAX   : Added. This is a simplified version of SYNTACTIC-WIND.

 * RENAMED MAKE-FLUID-IDENTIFIER -> MAKE-CAPTURING-IDENTIFIER:
   (the former made it sound more complicated than necessary).

Regards
Andre