[QUANTITY]Re: Quantity.owl

[DIDELON Pierre]

> From brian.thomas at gsfc.nasa.gov Thu Oct  9 15:59:12 2003
> From: Brian Thomas <brian.thomas at gsfc.nasa.gov>
> To: DIDELON Pierre <pdidelon at cea.fr>, dm at ivoa.net
> Subject: Re: [QUANTITY]Re: Quantity.owl
> 
> On Thursday 09 October 2003 05:28 am, DIDELON Pierre wrote:
> > Hi,
> >
> > is this the simple quantity class/concept that Ray want to subclass?
> > I must admit I am afraid, and for me it seems more related to
> > the analysis of a global structure concerning the more general
> > concept of VOData, related to [OBSERVATIONS] theme.
> 
> 
> 	Yes, this is directly related to Ray's quantity DM proposal.

Does Ray contribute to this proposition?
 
>	The quantity
> 	we propose is a very reusable class that may be mapped into tables,
> 	spectra, images, parameters, etc. Even algorithmic representation is
> 	possible with this model. 

It seems very complex and quite diff. from a basic DM stone
as previously forseen for quantity, it implicitly implies a lot of  
design decission without any consensus. 

> 
> 	Why afraid? These things have to tie together at some point. Our
> 	view is that the UCD are concepts that will inherit (as a class) 
>	from the quantities

Will VO specialists and CDS agree on that?

> 	in the DM. This allows people in the VO to describe ALL of thier holdings
> 	in terms of UCDs (not just the columns on their tables). Interface documents,
> 	in XML, based in the quantity DM, can be used for searching data repositories.

Is this really the original purpose of quantity?
> 
> 	I have a draft of our position paper that I hope to release publically soon. I
> 	will have a poster on this work at the ADASS. Please come by :)
> 
I will not attend ADASS.

PD