[OBSERVATIONS] model proposition for generic Process and Data and more specific data: Catalog

[DIDELON Pierre]

Hi DataModelers,

for whose who are not yet in vacation,
some additional material concerning the modelling
of OBSERVATIONS, the big-picture which can be used 
as root, where subsequent dev. and modelling
would/could be plug-in.

The DM front page have been modified, by M.Leoni (thanks),
to reflect the group structure subdivision, defined in Cambridge.
So, my previous three diag. posted (http://www.ivoa.net/forum/dm/0061.htm)
concerning the basic relations between processing, data and history 
(previously store in the front page), have been moved to the
OBSERVATIONS page.
I have added there 
(http://www.ivoa.net/twiki/bin/view/IVOA/IVOADMObservationsWP)
three more precise diagramms, which detail Processes, Data and Catalog. 
The existing links in the root diagramm are not repeated here,
but must not be forget, at least to get an idea of the history handling.
The Catalog case is a specialization of the data structure and show
how the needs for an history handling at CatEntryProperty level
can be introduced.

Comments welcome,
and happy holidays,

Pierre
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DIDELON                               e-mail : pdidelon at cea.fr
CEA SACLAY - Service d'Astrophysique  W3 : http://www-dapnia.cea.fr/Sap/
91191 Gif-Sur-Yvette Cedex            Phone : 33 (1) 69 08 58 89
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