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is intended that you will probably need to extend it to be able to
extract item data from whatever location you have stored them.

This is usually a fairly simple two step process.

=over 4

=item Overload the C<new> method.

Assuming your subclass takes some form or argument on creation, you will
need to overload the C<new> method to accept the arguments, validate them,
and store them in the source object.

=item Define the method C<_load_item_list>.

Leaving our parent's C<load> method to take care of conflict, errors, and
whatever, the C<_load_item_list> method is used to simply create a list of
L<Algorithm::Dependency::Item> objects from wherever you store the item,
and return them as a list.

=back