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The caller has to know that a package MOFID creates a index context within MDR storage etc. I suggest making some convenience methods, which would access attribute indexes on StorableFeatured attributes, which would hide these implementation details.
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.