[Esip-discovery] proposed mods for collection-level responses

[Lynnes, Christopher S. (GSFC-6102)]

As I was working with Ruth on a collection casting example, we ran across an area that we have not fully specified, namely how to identify links that access data collections that are NOT simply URLs for OpenSearches.  These access points may be single-file datasets, OPeNDAP, THREDDS, FTP directories, databases, order forms, dataset landing pages with links to access points...

OTOH, we would like to keep the scheme congruent with a granule level response as much as possible.  So I propose the following
Collection Access Point	rel		type
=======================	===============	====================================
FTP Directory tree	archives	application/x-ftp-directory
OPeNDAP Directory Tree	archives	application/x-opendap-directory+html (would also include xlink:arcrole=#dir)
THREDDS Catalog		archives	application/x-thredds-catalog+xml (would also include xlink:arcrole=#thredds)
Single-file dataset	enclosure	<depends on data format>
Order form		archives	text/html
Dataset landing page	archives	text/html

Comments?
--
Dr. Christopher Lynnes     NASA/GSFC, Code 610.2    phone: 301-614-5185
"Perfection is achieved, not when there is nothing left to add, but when there is nothing left to take away" -- A. de Saint-Exupery