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1) Notes are only present in a Selection object if it is being used as a cut buffer. They are never stored there as part of "normal selection" - that is delegated/left to MidiRegionViews that own the notes. 2) MidiRegionViews are stored in the Selection as "just" RegionViews, so provide a convenience method to access them. This doesn't actually change much, since even the old MidiRegions object was actually just a RegionSelection i.e. RegionViews.
Please see the Ardour web site at http://ardour.org/ for all documentation..
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http://ardour.org/development.html