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[equinox-dev] managing "extra" classes

In a few (and seemingly growing number of) places we have bundles that need to compile against say J2SE 1.4 but in practice we want them to run against Foundation.  This is cool because it allows us to run in small places but take advantage of function when it is available.  We currently have a mixed approach to this however.  For example in org.eclipse.osgi we have a set of JARs that contain shell apis for the OSGi ee.minimum 1.1 and we compile against these.  We also have a set of "exception" (extra) jars that similarly just contain class signatures for us during compilation.  In other bundles we do things like
        Bundle-RequiredExecutionEnvironment: J2SE-1.4,CDC-1.0/Foundation-1.0,J2SE-1.3
This uses an intentional quirk of PDE that uses the first EE on the list as the compilation base for the project.  That's pretty cool and useful for getting going but it has some downsides:
- it muddies the waters by confusing the metadata
- it allows people to use any 1.4 classes/methods thus opening the doors to mistakes

So I wonder if we should apply the first technique more broadly and seek to eliminate instances of the second in our bundle set?  It seems that we just need a mechanism for easily creating/managing these shell jars and then we can have very detailed control over what we use in our bundles.