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The framework must maintain dependencies from a manager to its installed virtual bundles so when a manager is refreshed, then all of its virtual bundles will be refreshed too. If the class implementing the VirtualModule instance comes from a bundle other than the manager, then the framework should associate an implicit dependency between this other bundle and the virtual module too so it is refreshed when this other bundle is refreshed, in addition to the manager.

NOTE: It is not necessarily clear that we need to directly support this last case.

Effective time of a virtual module

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