Configuration packages

It is possible to set up multiple configuration packages. The default configuration package opens the following structures:

• module-system, which exports define-structure and the other configuration language keywords, as well as standard types and type constructors ( :syntax, :value, proc, etc.).
• built-in-structures, which exports structures that are built into the initial Scheme 48 image; these include scheme, tables, and records.
• more-structures, which exports additional structures that are available in the development environment; these include sort, random, and threads.

You can define other configuration packages by simply making a package that opens module-system and, optionally, built-in- structures, more- structures, or other structures that export structures and interfaces.

For example: =0pt=0pt=0pt =0pt[] > ,config (define-structure foo (export ) (open module-system built-in-structures more-structures)) > ,in foo foo> (define-structure x (export a b) (open scheme) (files x)) foo>

• =0pt=0pt=0pt =0pt
  ,config-package-is struct-name

  The ,config-package-is command designates a new configuration package for use by the ,config command and resolution of struct-names for other commands such as ,in and ,open.