I think it would be useful to include a collected CND of all specified nodetypes in the jcr-2.0.jar mainly
as reference. although some repositories might use a slightly different definition of the nodetypes,
there still might be some that could use this CND 'as-is' for internal purposes.
the proposed location would be:
a simpler solution could just include the CND in a 'code' block in the javadoc of the nodetypes package