The only think I can see subclassing be useful for is if you have to deal with more than one configuration file per application. I read the problem as needing to have a single config file shared by many modules.

Reusability is not affected. Any other application that needs to have a single config file shared by many modules can reuse this module.

In reply to Re^3: Application-wide configuration by ikegami
in thread Application-wide configuration by akho

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