[QUANTITY] Why quantities sometimes have errors

[Brian Thomas]

On Monday 17 November 2003 01:57 pm, David Berry wrote:
> Doug,
>      Agreed. Associations are much easier to handle and extend than
> inheritance structures. The only thing to be careful of is that the
> components which are associated together need to be carefully designed to
> be orthogonal - for instance, so that all the WCS functionality is in one
> component, and all the error functionality is in another, and so on. It is
> possible to get into a situation where future developments of one
> component are made difficult because of restrictions imposed by other
> components.

	This is exactly my sentiment too. Multi-dimensionality of quantities
	appears to place some restrictions/requirements on how transformations,
	errors, units and data type are all to be used. Thus, I believe, they are very 
	much worth considering now.

	Regards,

	-b.t.

-- 

  * Dr. Brian Thomas 

  * Code 630.1 
  * Goddard Space Flight Center NASA

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