[plt-scheme] define syntax

http://objectmix.com/scheme/186102-possible-define-syntax-define-struct.html

Day wrote:
> I have an interesting and curious question:
>
> Is it possible to define define-syntax using Scheme (without using any
> higher macros, just scheme itself)?
>
> You know that macros of a language is in a higher level than the
> language itself. It's said it's easy to define a low level notion in
> higher level objects, but it's hard vice versa. We can use define-
> syntax etc. to define a transformation rule. How about using scheme to
> define that that defines transformation rule?
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