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(guile.info)Scheme and modules

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Scheme and modules
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Scheme, as defined in R4RS, does _not_ have a module system at all.

Aubrey Jaffer, mostly to support his portable Scheme library SLIB,
implemented a provide/require mechanism for many Scheme implementations.
Library files in SLIB _provide_ a feature, and when user programs
_require_ that feature, the library file is loaded in.

For example, the file `random.scm' in the SLIB package contains the line
     (provide 'random)
so to use its procedures, a user would type
     (require 'random)
and they would magically become available, _but still have the same
names!_  So this method is nice, but not as good as a full-featured
module system.