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Dear colleagues,
At the last OGC TC Meeting in Boulder, we discussed the issue of registering a
MIME type for netCDF.
As I remember, someone (at Unidata?) may be drafting a proposal, possibly
following what's in use for xml.
I've given this an extra thought, while working on UncertWeb and the
Uncertainty Conventions, that I'm sharing here.
First, as a temporary solution, we are using the "application/x-netcdf" MIME
subtype.
The biggest issue is with netCDF conventions, since a single netCDF file may
comply with multiple conventions.
This gets in the way with a possible hierarchical structure of MIME sub-typing,
like e.g.:
x-netcdf-<convention1>-<convention2>...
We may take the xml approach of a "+netcdf" suffix, but this wouldn't
solve/address the problem.
So I would suggest an optional "conventions" parameters with the same syntax
and semantics as the global "Conventions" attribute in netCDF.
The content-type of a netCDF-U dataset may look like:
application/x-netcdf; conventions="UW-1.0 CF-1.5"
We may take the same approach with the version, although I'd probably go for an
"application/x-netcdf-4" subtype, in that case.
I would be interested in comments on this, also to align with what is being
drafted.
Best regards,
Lorenzo
Il giorno 30/set/2011, alle ore 23:18, Ben Domenico ha scritto:
> Hi all,
>
> The CF-netCDF SWG session was held Thursday morning September 22, 2011 at
> UCAR in Boulder. A summary is given below. If anyone who attended the SWG
> has additions or corrections, please let us know.
>
> -- Ben
>
> ==========================================
>
> CF-netCDF SWG Session at the September 2011 OGC TC Meetings in Boulder
>
> Agenda
>
> The agenda consisted of:
> CF extension to the netCDF core standard (Stefano Nativi)
> CF-netCDF extension to the WCS core standard (Stefano Nativi)
> Enhanced Data Model extension to the netCDF core standard (Ben Domenico)
> Uncertainty model for netCDF-CF (Lorenzo Bigagli and Stefano Nativi)
> Determine how to deal with errors in existing netCDF binary standard noted by
> Simon Cox (see next slide)
> Item 5 was taken care of in brief discussions with Carl Reed and Simon Cox
> outside the SWG session. They both agree that the changes are not
> substantive, so the typos can be corrected in the existing spec and a phrase
> can be inserted clarifying that Requirement 1 is a special type of
> requirement, namely, a dependency.
>
> The presentations and draft documents are available at:
>
> https://portal.opengeospatial.org/index.php?m=projects&a=view&project_id=82&tab=2&artifact_id=45016
>
> Issues
>
> A couple additional issues came up during the discussion
> There is a need to register a mime type for netCDF with IANA. The question
> is whether to try to come up with all the modifiers (e.g. netCDF-3, netCDF-4,
> netCDF-CF,…) before submitting request. The sense of the group is that a
> base mime type necdf should be registered with modifiers for netCDF-,
> netCDF-4, CF-netCDF, etc.
> With the new modular approach to specifications, OGC is creating a bit of a
> Humpty Dumpty Problem of having too many modules in specs, too many
> conformance classes within modules, etc. As a consequence, potential new
> users can be overwhelmed. It isn't always clear how to assemble fragments
> into a coherent, working whole. Primers with an overall overview are a help
> by not a solution. One new possibility is to emphasize the need for overview
> information in Profile specs where the application to a particular community
> is documented.
> Action Items (all internal to the SWG)
> Make non-substantive edits to existing netCDF binary encoding spec. See note
> in Agenda above. (Ben Domenico)
> In the CF Extension to netCDF core, some items that are optional for CF are
> mandatory in the proposed OGC specification. A list of these items will be
> circulated with the call for comments. (Stefano Nativi)
> The CF-netCDF overview and planning documents should indicate that
> XML-encoding is addressed in CF-netCDF extension to WCS. (Ben Domenico)
> Discussion paper for netCDF uncertainty conventions will be captured in a
> discussion paper for next TC. Will include netCDF3 and netCDF4 options and
> will pursue with CF conventions community in parallel (Lorenzo Bigagli)
> Motions
>
> There were no motions at this SWG
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