[QUANTITY]Re: Quantity.owl

[Brian Thomas]

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. 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. 

	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
	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.

	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 :)


						=b.t.

-- 

  * Dr. Brian Thomas 

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  * Goddard Space Flight Center NASA

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