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

[Giaretta, DL (David)]

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
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