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It is of the utmost importance to keep core and extension functionality separated.

The criterium for this should be in the dependency tree of the respective modules: core modules should never depend on extension modules but are free to depend on one another. Similarly: extensions modules can freely depend on any core modules but should, generally, not depend on one another.

Furthermore: the core API should provide for hooks to allow for any of the extension modules. Hooks should be added only when an actual need for them exist and not beforehand, as we should keep the code, API and documentation as simple as possible.

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