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It is not possible to request existence of implementation module directly from its API module, thus API clients have to declare both depencency on the API and token dependency (-Requires) on some impl module. It would be much better it the API module could request presence of its implementation itself. E.g. the org.openide.io API clients have to depend on the org.openide.io module and have to request IOProvider, while it would make more sense to just depend on org.openide.io module. The io module shouldn't be enabled without some implementation as it is unusable otherwise.
*** This issue has been marked as a duplicate of 34699 ***
OK