[QUANTITY] Use-cases, role in larger scheme (Was: Re: [QUANTITY] Quantity "arguments")

[Brian Thomas]

	Hi Doug,

	Your answer left me with a lot of questions.

On Friday 14 November 2003 05:16 pm, Doug Tody wrote:
> Much of the top level use-case analysis has already been done and we are to
> the point now where we have a service architecture and are looking at the
> details of data queries, data modeling, data representation and mediation
> to external data. 

	If this is the case, where might I find the documentation on the requirements
	analysis? Is it posted to the Twiki somewhere and I missed it? Who
	is "we"? What is the top-level (I assume that means "oberservation", correct?)

> Indeed top level applications like this are where we should start with
> VO use-case analysis.  A first iteration on this has already been done:
> case 1 below is one of the NVO use cases which led to the cone search and
> SIA services (to get catalog and image data) and to what is now called
> the 'DIS' (data inventory) service from HEASARC.  

	My impression of the earlier NVO demos was that they were just that, demos.

	Are these now to be considered "prototypes"? Isnt there quite a bit of needed
	flexibility, functionality and depth of utility missing from these to consider them 
	worth extending into a real system?

	Regards,


	=b.t.

-- 

  * Dr. Brian Thomas 

  * Code 630.1 
  * Goddard Space Flight Center NASA

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