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+;;;; "dbsyn.scm" -- Syntactic extensions for RDMS (within-database)
+;;; Copyright (C) 2002 Ivan Shmakov <ivan@theory.dcn-asu.ru>
+;;
+;; Permission to copy this software, to modify it, to redistribute it,
+;; to distribute modified versions, and to use it for any purpose is
+;; granted, subject to the following restrictions and understandings.
+;;
+;; 1.  Any copy made of this software must include this copyright notice
+;; in full.
+;;
+;; 2.  I have made no warranty or representation that the operation of
+;; this software will be error-free, and I am under no obligation to
+;; provide any services, by way of maintenance, update, or otherwise.
+;;
+;; 3.  In conjunction with products arising from the use of this
+;; material, there shall be no use of my name in any advertising,
+;; promotional, or sales literature without prior written consent in
+;; each case.
+
+;;; History:
+
+;; 2002-08-01: I've tired of tracking database description elements
+;; (such as `(define-tables ...)'); so I decided to use `etags'.  But
+;; its hard (if possible) to create regexp to match against RDMS' table
+;; specs.  So I wrote `within-database' syntax extension and now I can
+;; simply use something like:
+
+;; $ etags -l scheme \
+;;         -r '/ *(define-\(command\|table\) (\([^; \t]+\)/\2/' \
+;;         source1.scm ...
+
+;; ... and get TAGS table with all of my database commands and tables.
+
+(require 'relational-database)
+(require 'database-commands)
+(require 'databases)
+;@
+(define-syntax within-database
+  (syntax-rules (define-table define-command)
+
+    ((within-database database)
+     database)
+
+    ((within-database database
+                      (define-table (name primary columns) row ...)
+                      rest ...)
+     (begin (define-tables database '(name primary columns (row ...)))
+            (within-database database rest ...)))
+
+    ((within-database database
+                      (define-command template arg-1 arg-2 ...)
+                      rest ...)
+     (begin (define-*commands* database '(template arg-1 arg-2 ...))
+            (within-database database rest ...)))))