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I case of using memory storage implementation, it would be useful to have the metamodels "persistent" in some (quickly accessible) way. So there should be some mechanism that loads the initial content of the memory storage at startup. Perhaps the soure for the initial content could simply be a repository, created by the b-tree storage implementation.
This is already possible using a storage federation. We should provide an example code on how to do that.
I am closing all reports in category Java/Unsupported as wontfix. These should be dead issues --- if the reported cases are against some live part of the NetBeans IDE please reopen and we can discuss to which category they belong.