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FileSet composition methods don't specify the behaviour of the product with respect to the particles. FileSets.intersection and FileSets.union return new FileSet from two operands, but it is not specified nor in the signatures nor in the documentation, whether the product changes, when the sources change - whether it is connected by reference, or the entries are coppied. It would be best, if the behaviour was expressed in the signature of the return value (should return something like BinaryFileset or CompositeFileset) so that nobody could inadverently change the contract in the future. Or, at least write it in the documentation.
Documentation slightly improved.
As described in http://www.netbeans.org/servlets/ReadMsg?msgId=619519&listName=nbdiscuss the current work on projects prototype has been stopped. Marking issue as VERIFIED --->
---> CLOSED