@ISA does the same thing here that it does in an
OO module. It defines other modules that Perl should search
for subroutines that you don't define in your module.
For example, in this case use Module is
(almost) the same as:
require Module;
Module::import;
So Perl tries to call the import function in
your module. Your module doesn't have an import
function so Perl searches the modules in @ISA
and calls the first instance of import that it
finds. This is in Exporter. Exporter::import does all sorts
of clever things and exports the contents of your
@EXPORT_OK array into the calling package.
Update: Ridiculous typo corrected. Thanks to
ryddler.
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