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There are several situation when user creates references to another project (e.g. when defining the resource project P1 as an output of project P2's build target). The project system should be able to keep track of those inter-project dependencies and warn user when some projects which the project depends on are not available. The relevant uispec sections are 6.2 - 'Recover Referenced Project' action and 4.7.3 - 'Recovering Lost Projects'.
This depends on the final state of uispecs.
As described in http://www.netbeans.org/servlets/ReadMsg?msgId=619519&listName=nbdiscuss the current work on projects prototype has been stopped.
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