[plt-scheme] define syntax

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?