Using Quantity in Char model (Was: Re: Characterization data model

[Brian Thomas]

	Hi Francois, all,

	A reply to your reply (to my reply..) which involves matters of implementation
	of Quantity ("Q") within the Characterization ("Char") data models. In large,
	I think we agree, so I will skip to the "issue" outstanding.

On Monday 23 May 2005 11:03 am, Francois Bonnarel wrote:
>  
> However There has been some misunderstanding of what we did (or tried to do). 
> 
>        By defining CharQuantity we wanted to have a container common to all the main
> types of Characterisation and providing:
>        units, ucd, datatype, a name, and maybe the CoordSys.
> (You probably remember my (FB) brain is VOTable wired, and we want to use  a quantity
> which allow us the same than a FIELD or PARAM does).
> [snip]

	OK, to drill down to the problem I see:

	My issue is with adding in the "datatype, units" information in CharQuantity. It would 
	seem to me that it is not needed/redundant or is confusing (as in the case where a 
	child class has compound properties like 'limits').

	Perhaps I can understand better why you want them if you could explain to me 
	the application for this information across the child 'classes' (e.g. resolution, bounds, 
	etc).
 
	And that appears to be it. I will respond separately about the merger attempt in another
	email.

	Regards,

	=brian

-- 
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|                                     
| Dr. Brian Thomas                    
|                                     
| Dept of Astronomy                   
| University of Maryland-College Park 
|
| Phone: (301) 405-2312               
| Fax: (301) 314-9067                 
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