I should probably mention the importance in the design of a UCA module of
being able to specify which UCA version number you want it to behave like
in case you plan to override some of the DUCET entries.  That way if you
run under a later UCA with different DUCET weights, your own tailorings will
still make sense.  If you don't do this, your collation tailorings can break 
in a new release of the UCA.

--tom