Mixing R7RS libraries and MIT Scheme packages

[Lassi Kortela]

- Is it possible in (define-library ...) to import things exported from 
within (define-package ...)?

- What's the intended way to import most of MIT Scheme's built-in 
procedures? For example, in the Edwin sources there is:

(define-package (edwin string)
  ...
  (import (runtime character-set)
          char-set-table)
  ...)

How would one replicate this import in (define-library ...)?