Obstap / fixed

[Douglas Tody]

On Wed, 16 Mar 2011, Francois Bonnarel wrote:

> On the obs_title discussion:
> -----------------------------------------------
>
> /As far as I understand obs_title is a free text description. Maybe usefull 
> but the field name is confusing I think. Nothing to do with an ID./

Note that this is already in the data model (SSA/Spectrum) with the
name "title": DataID.Title.  It is also in SIA1 (VOX:Image_Title).
In both cases it is mandatory metadata.  The name derives from FITS
where it is commonly used for image data.  It is not an identifier
in the usual sense, but is part of dataset identification, providing
a human readable, free text (but short) description of the dataset.
This is commonly used in analyis software to e.g. describe a dataset in
a query response table, in a plot header, in the label of a displayed
image, and so forth.

 	- Doug