UPDM — SystemsNode

the relationship to OperationalNode appears to indicate that the op nodes
are part of the SystemsNode. This is inappropriate, as in both DoDAF and MODAF
operational nodes are logical entities that perform operational activities. They may be
realised as SystemsNodes, but to show structure in this way is a misunderstanding of the
intent behind MODAF and DoDAF. This is a common misunderstanding amongst DoDAF
users which has been cleared up in the MODAF 1.1 documentation