[ckan-dev] VoID

[Timothy Lebo]

Ross,

On Feb 15, 2013, at 1:42 PM, Ross Jones <ross at servercode.co.uk> wrote:

> 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.

Sweet. What will the alternate point to?
And, is that for just the individual dataset pages, or will that include the full dataset listing, too?

Thanks,
Tim

> 
> 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/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/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
> [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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