(defmodule maybe-req one-or-multi option ... pre-flow ...)
| #:require-form content-expr one-or-multi = module-spec | #:multi (module-spec ...+) module-spec = module-path | content-expr option = #:module-paths (module-path ...) | #:no-declare | #:use-sources (src-module-path ...) | #:link-target? link-target?-expr | #:indirect | #:lang | #:reader | #:packages (pkg-expr ...)
Each documented module specified as either a module-path (in the sense of require), in which case the module path is typeset using racketmodname, or by a content-expr. The latter case is triggered by the presence of a #:module-paths clause, which provides a plain module-path for each module-spec, and the plain module-path is used for cross-referencing.
If a #:require-form clause is provided and if #:lang and #:reader are not provided, the given expression produces content to use instead of require for the declaration of the module. The #:require-form clause is useful to suggest a different way of accessing the module instead of through require.
Besides generating text, unless #:no-declare appears as an option, this form expands to a use of declare-exporting with module-paths; the #:use-sources clause, if provided, is propagated to declare-exporting. Consequently, defmodule should be used at most once in a section without #:no-declare, though it can be shadowed with defmodules in sub-sections. Use #:no-declare form when you want to provide a more specific list of modules (e.g., to name both a specific module and one that combines several modules) via your own declare-exporting declaration
When #:link-target? is specified with an expression that produces a true value, then the module-paths are also declared as link targets though a part-tag-decl (which means that the defmodule form must appear before any sub-parts). These link targets are referenced via racketmodname, which thus points to the enclosing section, rather than the individual module-paths.
Specifying #:indirect normally makes sense only when #:link-target? is specified with a true value. Specifying #:indirect makes the module path that is displayed (and that normally refers to some other declaration of the module) use racketmodname with #:indirect.
If #:lang is provided as an option, then the module name is shown after #lang (instead of in a require form) to indicate that the module-paths are suitable for use by either require or #lang. If the module path for require is syntactically different from the #lang form, use #:module-paths to provide the require variant (and make each module-spec a content-expr).
If #:reader is provided, then the module name is shown after #reader to indicate that the module path is intended for use as a reader module.
By default, the package (if any) that supplies the documented module is determined automatically, but a set of providing packages can be specified explicitly with #:packages. Each pkg-expr result is passed on to a function like tt for typesetting. Provide an empty sequence after #:packages to suppress any package name in the output.
Each option form can appear at most once, and #:lang and #:reader are mutually exclusive.
The decoded pre-flows introduce the module, but need not include all of the module content.
(declare-exporting module-path ... maybe-sources)
| #:use-sources (module-path ...)
More significantly, the first module-path before #:use-sources plus the module-paths after #:use-sources determine the binding that is documented by each defform, defproc, or similar form within the section that contains the declare-exporting declaration:
If no #:use-sources clause is supplied, then the documentation applies to the given name as exported by the first module-path.
If #:use-sources module-paths are supplied, then they are tried in order before the first module-path. The module-path that provides an export with the same symbolic name and free-label-identifier=? to the given name is used as the documented binding. This binding is assumed to be the same as the identifier as exported by the first module-path in the declare-exporting declaration.
Use #:use-sources sparingly, but it is needed when
bindings are documented as originating from a module M, but the bindings are actually re-exported from some module P; and
other documented modules also re-export the bindings from P, but they are documented as re-exporting from M.
For example, the parameterize binding of mzscheme is documented as re-exported from racket/base, but parameterize happens to be implemented in a private module and re-exported by both racket/base and mzscheme. Importing parameterize from mzscheme does not go through racket/base, so a search for documentation on parameterize in mzscheme would not automatically connect to the documentation of racket/base. To make the connection, the documentation of racket/base declares the private module to be a source through #:use-sources, so that any re-export of parameterize from the private module connects to the documentation for racket/base (unless a re-export has its own documentation, which would override the automatic connection when searching for documentation).
The initial module-paths sequence can be empty if module-paths are given with #:use-sources. In that case, the rendered documentation never reports an exporting module for identifiers that are documented within the section, but the module-paths in #:use-sources provide a binding context for connecting (via hyperlinks) definitions and uses of identifiers.
(defmodulelang one-or-multi maybe-sources option ... pre-flow ...)
(defmodulelang one-or-multi #:module-path module-path option ... pre-flow ...)
(defmodulereader one-or-multi option ... pre-flow ...)
(defmodule* maybe-req (module-spec ...+) option ... pre-flow ...)
(defmodulelang* (module-spec ...+) option ... pre-flow ...)
(defmodulereader* (module-spec ...+) option ... pre-flow ...)
(defmodule*/no-declare maybe-req (module-spec ...) option ... pre-flow ...)
(defmodulelang*/no-declare (module-spec ...) option ... pre-flow ...)
(defmodulereader*/no-declare (module-spec ...) option ... pre-flow ...)