New release of ObsCore Proposed recommendation document

[Mireille Louys]

Dear all ,

I attached a new release of the proposed recommendation for ObsCore  
data model at

http://www.ivoa.net/cgi-bin/twiki/bin/view/IVOA/ObsCoreRFC

2 files are available: in docx and in pdf format.
I inserted typos corrections, some reformulations and updated the  
items moved from optional to mandatory status.
Plus some editing of all tables, to have a more coherent view.

Thanks to you for providing the feedback for this specification during  
the last 6 months.

Cheers, Mireille