[QUANTITY] An object- and domain-oriented proposal in UML and XML

[Arnold Rots]

David,

Just a quick comment on your first point.
I agree that in principle the data model should not be implementation
specific.  However, I think it is important to keep in mind that the
reference mechanism is (should be) available when it comes to a
practical implementation.  Or, put differently: I think it is
reasonable to require implementations to incorporate the capability to
use references; with that in mind, the ID/IDREF part is not really XML
specific.

  - Arnold

Giaretta, DL (David)  wrote:
> Brian
> 
> I'm a little concerned that your paper seems to be an XML specific data
> model - things like the Id and IdRef.
> 
> It seems to me that we should be very clear that the data model should be
> independent of the format of the data. The same data can - and probably will
> - be represented as FITS, XML, Ascii, etc. We should clearly separate the
> representation from the actual information and one of the tests of the data
> model must surely be - "does it work if this piece of data is a FITS file"
> and "does it work if the data is pure XML" - and we'd better get an answer
> "yes" for both.
> 
> The Open Archival Information System Reference Model (OAIS)
> (http://wwwclassic.ccsds.org/documents/pdf/CCSDS-650.0-B-1.pdf) - now an ISO
> standard - carefully distingusihes between Content Information and
> Representation Information and I think this is an important distinction.
> 
> ...David
> 
> 
> 
> -----Original Message-----
> From: Brian Thomas [mailto:thomas at mail630.gsfc.nasa.gov]
> Sent: 27 May 2003 18:33
> To: dm at ivoa.net
> Subject: [QUANTITY] An object- and domain-oriented proposal in UML and
> XML
> 
> 
> 
> 	Hi all,
> 
> 	Ok, since I see others have put together proposals for the simple
> quantity, now
> 	Ed and I have also done so. What is different about this proposal?
> Concisely,
>  	it describes an object- and domain-oriented simple quanties data
> model. We
>  	use these technologies in order to enable a number of important
> requirements,
> 	including the ability for the quantity data model to describe data
> at every data 
> 	repository using machine readable inheritable
> concepts/classes/standards.
> 
> 	Whitepaper is available in a variety of formats from the following
> URLS:
> 
> 	http://nvo.gsfc.nasa.gov/DataModel/VOSimpleQuantityDataModel.html
> 	http://nvo.gsfc.nasa.gov/DataModel/VOSimpleQuantityDataModel.doc
> 	http://nvo.gsfc.nasa.gov/DataModel/VOSimpleQuantityDataModel.sxw
> 
> 	(where the extension tells you what you are dealing with...the last
> is the
>     	openoffice format).
> 
> 
> 					Regards,
> 
> 					=b.t.
> 
> -- 
> 
>   * Dr. Brian Thomas 
> 
>   * Code 630.1 
>   * Goddard Space Flight Center NASA
> 
>   *   fax: (301) 286-1775
>   * phone: (301) 286-6128
> 
> The most serious doubt that has been thrown on the authenticity of the
> biblical miracles is the fact that most of the witnesses in regard to
> them were fishermen.
> 		-- Arthur Binstead
> 
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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head-cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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