Notes on an extension to Sexp syntax

TODO

@@ -25,3 +25,30 @@ Switch from indirect scheduling to direct scheduling
    once) so it always goes back to the scheduler because the worklist
    is never longer than one.
  - Revisit once we start testing multiple concurrent streams.
+
+
+Extension to Sexps:
+
+ - ! <simplestring> <value> : binds the simplestring to the value when
+   seen. Note that the new binding for simplestring is NOT in scope
+   during parsing of the value, so no circular data can be constructed
+   this way. Any previous binding is discarded *after* the value is
+   completely read.
+
+ - ? <simplestring> : retrieves the bound value of the simplestring.
+
+So
+	!1:a11:hello world(?1:a1: ?1:a1: ?1:a)
+is equivalent to
+	(11:hello world1: 11:hello world1: 11:hello world)
+
+And, more to the point, after a receiver has seen
+	!1:a36:af49f5dc-0454-4ba1-9f48-a55e9c10ee35
+then a simple
+	?1:a
+is all that's needed to refer to that gargantuan UUID.
+
+Another example:
+	!1:a()!1:a(?1:a?1:a)!1:a(?1:a?1:a)?1:a
+is equivalent to
+	((()())(()()))