[Alberto Micol]

Hi Andrea,

Sorry to come back with this, but there is another possibility...
If we state that each UCD word MUST end with the ';' character,
-that is, even if there are no other subsequent words- then
no UCD can ever be a substring of another one.

Example:

phot.flux; is not a substring of phot.fluxDens;

The beauty of it is that no other changes are required.

It is my laziness... I always prefer to change the least...

Alberto
PS: I send this email because I'm sure you are expecting it from me ;-)
PPS: And I promise that this is the last time I mention this.

On Nov 7, 2005, at 16:47, Andrea Preite Martinez wrote:

> Dear all,
>
> I received from the IVOA Exec a request to modify all UCD1+ words that  
> do not conform to what is said in the standard UCD document, i.e.:
>
>  UCD1+ words at the same level in the hierarchy cannot be a starting   
> substring of another
>
> that is, we cannot have phot.flux and phot.fluxDens
>
> As you know, the document at
> http://www.ivoa.net/Documents/latest/UCDlist.html
> is in the PR status, and will be moved to IVOA Recommendation after an  
> appropriate action on the words concerned.
>
> The rule mentioned above is violated for the following ucd1+ words:
>
> E | phot.fluxDens               | Flux density (per wl/freq/energy  
> interval)
> E | phot.fluxDens.sb            | Flux density surface brightness
> Q | phys.atmol                  | Atomic and molecular physics (shared  
> properties)
> Q | phys.atmol.branchingRatio   | Branching ratio
> Q | phys.atmol.coll             | Related to collisions
> Q | phys.atmol.configuration    | Configuration
> Q | phys.atmol.crossSection     | Atomic / molecular cross-section
> Q | phys.atmol.element          | Element
> Q | phys.atmol.excitation       | Atomic molecular excitation parameter
> Q | phys.atmol.final            | Quantity refers to atomic/molecular  
> final/ground state, level, ecc.
> Q | phys.atmol.initial          | Quantity refers to atomic/molecular  
> initial state, level, ecc.
> Q | phys.atmol.ion              | Ion
> S | phys.atmol.ionization       | Related to ionization
> S | phys.atmol.level            | Atomic level
> Q | phys.atmol.lifetime         | Lifetime of a level
> Q | phys.atmol.lineShift        | Line shifting coefficient
> Q | phys.atmol.parity           | Parity
> Q | phys.atmol.sweight          | Statistical weight
> S | phys.atmol.trans            | Transition between states
> Q | phys.energyDensity          | Energy-density
> Q | phys.massToLight            | Mass to light ratio
> Q | phys.massYield              | Mass yield
>
> because of the already existing words
> phot.flux
> phys.at
> phys.energy
> phys.mass
>
> In order to reach a rapid convergence on the reformulation of these  
> words, I?m suggesting a possible solution for each of them in the list  
> that follows:
>
>    Present                       Suggested new
> E | phot.fluxDens               | phot.flux.fluxDens  or:  
> phot.flux.density
> E | phot.fluxDens.sb            | phot.flux.fluxDens.sb  or:  
> phot.flux.density.sb
> Q | phys.atmol                  | suppress
> Q | phys.atmol.branchingRatio   | phys.branchingRatio
> Q | phys.atmol.coll             | phys.collision
> Q | phys.atmol.configuration    | phys.state.configuration
> Q | phys.atmol.crossSection     | phys.crossSection
> Q | phys.atmol.element          | phys.element
> Q | phys.atmol.excitation       | phys.excitation
> Q | phys.atmol.final            | phys.state.final
> Q | phys.atmol.initial          | phys.state.initial
> Q | phys.atmol.ion              | phys.element.ion    S |  
> phys.atmol.ionization       | phys.ionization
> S | phys.atmol.level            | phys.level
> Q | phys.atmol.lifetime         | phys.level.lifetime
> Q | phys.atmol.lineShift        | phys.lineShift
> Q | phys.atmol.parity           | phys.state.parity
> Q | phys.atmol.sweight          | phys.state.sweight
> S | phys.atmol.trans            | phys.state.trans   Q |  
> phys.energyDensity          | phys.energy.density
> Q | phys.massToLight            | phys.mass.light
> Q | phys.massYield              | phys.mass.yield
>
> The other possibility for the phys.atmol.xxx group is to suppress the  
> word phys.at
>
> Please let me know your opinion and/or your suggestions.
>
> Andrea
>
>
> ======================================================================= 
> =======
> Andrea Preite Martinez                   
> andrea.preitemartinez at rm.iasf.cnr.it
> Istituto di Astrofisica Spaziale        Tel.:+39.06.4993.4641
> Area di Ricerca di Tor Vergata          Fax.:+39.06.2066.0188
> Via del Fosso del Cavaliere 100         Cell:+39.320.43.15.383
> 00133 Roma                              CDS :+33.3.90242473
> ======================================================================= 
> =======
>
>
Alberto Micol
ST-ECF HST Archive Scientist