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There are several efforts to provide projects with several source roots and building targets. Probably there could at least some of them better be organized as a collection of loosely coupled projects than as a "big-bang-project". E.g. platform projects could include references to vendor-specific support-modules. A multi-project should only contain references, so the sub-projects could be opened independently. The project.xml could e.g. look like that: <multiproject name="..."> <!-- a "standard" project reference, e.g. app, webapp, freeform, etc. --> <project base="..."/> <!-- a module cluster / attribute nbhome makes it possible to write modules to different NB installations --> <cluster name="..." nbhome="..."> <!-- a module project reference --> <project base="..."/> </cluster> </multiproject> Of course, the appropriate namespace etc. have to be declared and probably some other important elements and attributes.
Actually you can already create cluster-like projects with a freeform project that just has <subprojects>, but there is no GUI for it. Re. "cluster" and "nbhome", you're probably talking about something in apisupport/project, which is specific to NB module development and quite separate from general-purpose (user-oriented) project functionality. *** This issue has been marked as a duplicate of 50683 ***