draft PR doc on ucd-words

[Doug Tody]

On Mon, 11 Jul 2005, Andrea Preite Martinez wrote:
> Note for the Sci-board: I included the last comments. I also had to modify a
> number of words to be compliant with the UCD-Rec document ("... for any two
> words at the same level in the hierarchy, one can't be a starting substring
> of the other..."), so
> 
> old version  =============>  new version
> 
> phot.fluxDensity             phot.fluDensity
> phys.energyDensity           phys.energDensity
> phys.massYield               phys.mYield
> pos.earthop                  pos.eop

I haven't been following the UCD discussions, and while I am sure there
is some reason for this change, these name changes do not look like
an improvement.  The "old" version is clearly preferable here.

	- Doug