[ckan-dev] VoID

[Ross Jones]

Tim,

I've just noticed that there is no alternate link in the header to help in
discovery when viewing a dataset's HTML page, I'll submit a pull request to
the guys over the weekend to add it.

Ross.



On Fri, Feb 15, 2013 at 5:32 PM, Timothy Lebo <lebot at rpi.edu> wrote:

> Ross,
>
> I'd love if CKAN used VoID (or, DCAT) natively.
>
> It certainly would help me access the listings in an arbitrary CKAN.
>
> For example, it was a bit more difficult than we would have hoped for us
> to get the entries from http://hub.healthdata.gov/dataset (some notes
> at [1]).
>
> It would have been great to just grab  http://hub.healthdata.gov<http://hub.healthdata.gov/dataset>/void.ttl
> and run with the RDF descriptions of all the datasets (some notes at [2]).
> Or -- even better -- just conneg http://hub.healthdata.gov/dataset with
> an Accept: application/rdf+xml… (several other ways are mentioned in [2]).
>
> Please note that W3C's DCAT [3] can be used to describe _any_ kind of
> dataset, not just RDF datasets.
> We ended up crawling CKAN to produce DCAT entries for all of its datasets
> (notes at [4];  an example at [5] which includes W3C's PROV-O assertions at
> two levels).
>
> I think VoID should be seen as a special case of DCAT, in the case where
> one has RDF datasets.
>
> There are some nice features that VoID offers that DCAT does not (such as
> the "top level" http://hub.healthdata.gov<http://hub.healthdata.gov/dataset>/void.ttl file
> to "just get the listing"), and CKAN's needs could inspire the W3C GLD team
> to get them into DCAT, which is still in development.
>
> Regards,
> Tim Lebo
>
> [1]
> https://github.com/jimmccusker/twc-healthdata/wiki/Accessing-CKAN-listings
> [2]
> https://github.com/jimmccusker/twc-healthdata/wiki/Using-VoID-for-Accessibility
> [3] http://www.w3.org/2011/gld/wiki/Data_Catalog_Vocabulary
> [4]
> https://github.com/jimmccusker/twc-healthdata/wiki/Retrieving-CKAN%27s-Dataset-Distribution-Files<https://github.com/jimmccusker/twc-healthdata/wiki/Retrieving-CKAN's-Dataset-Distribution-Files>
> [5]
> https://github.com/jimmccusker/melagrid/blob/master/data/source/data-melagrid-org/e-geod-11584/access.ttl
>
>
> On Feb 15, 2013, at 12:01 PM, Ross Jones <ross at servercode.co.uk> wrote:
>
> I've been looking at http://www.w3.org/TR/void/ and thought it might be
> worth taking a look at implementing it for CKAN as it has been asked for
> more than once, and seems like a useful way of finding the datasets that
> are available as RDF.
>
> As CKAN doesn't really model the relationships between datasets, other
> than membership of groups, I wondered whether it would be enough for the
> void file to simply be a collection of void:Datasets so that at least it
> would aid in discovery via void.(rdf|ttl) even if it didn't attempt to
> describe the relationships between them?
>
> Any suggestions, or general guidance appreciated.
>
> Ross
>
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