In an earlier discussion about repository aggregation, Pascal mentioned
that p2 now supports nested repositories. We would like to exploit that,
at least for the ArtifactRepositories that we make available but that
begs the question; what happens with backward compatibility with Eclipse
3.4.x? Will nested repositories be made available in 3.4.2? If not, will
there be some way to install them into a profile using a 3.5 installer
so that they can be used by Eclipse 3.4.x?