[Nausicaa Delmotte]

Hi,

   But what is preventing us from adding the semicolon as ending separator?
   I do apologize for asking a question that seems to have already been 
answered in the past, but I could not find the answer in the archive 
mailing-list and since I did not follow all the UCD developments from 
the very beginning, probably I missed something.
   Could anybody give me a pointer to a discussion or a very brief 
comment on it?
   Or is it maybe to avoid having a possible NULL word at the end when 
parsing a UCD, assuming the ending semicolon?

Thank you
Nausicaa

Alberto Micol wrote:
> 
> 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

-- 
Dr Nausicaa Delmotte              @..@     ndelmott at eso.org
European Southern Observatory    (----)    Tel: +49 (0)89 3200 6418
Karl-Schwarzschild-Str. 2       ( >__< )   Fax: +49 (0)89 3200 6480
D-85748 Garching bei Muenchen   ^^ ~~ ^^   http://www.eso.org/~ndelmott/