[ckan-dev] Essence of DCAT and Linked data in CKAN

Fri Mar 15 11:03:39 UTC 2019

Thank you very much for your quick and precise response.

On Fri, Mar 15, 2019, 1:34 PM Steven De Costa <
steven.decosta at linkdigital.com.au> wrote:

> Here is the presentation from the Madrid CKANCon which Stefan is referring
> to :)
>
>
> https://www.slideshare.net/mobile/u10313335/open-data-web-a-linked-open-data-repository-built-with-ckan
>
>
> On Fri, Mar 15, 2019 at 8:24 AM, Stefan Oderbolz <odi at metaodi.ch> wrote:
>
>> Hi,
>>
>> Your questions are very broad, I try to answer them to the best of my
>> knowledge.
>>
>>
>> 1. What is the essence of DCAT in CKAN?
>>>
>>
>> CKAN does not support DCAT out of the box, but there is the ckanext-dcat
>> extension (https://github.com/ckan/ckanext-dcat) to add DCAT
>> functionality.
>>
>>
>>  2. How to see the information about DCAT in my CKAN instance?
>>>
>>
>> Assuming you're using ckanext-dcat, it provides several DCAT-specific API
>> endpoints to expose CKAN datasets or even the whole catalogue as RDF. Plese
>> see the README for details:
>> https://github.com/ckan/ckanext-dcat/blob/master/README.md#rdf-dcat-endpoints
>>
>>
>> 3. How can linked data help in CKAN repository.
>>>
>>
>> This depends on your use case. It might be useful to expose your metadata
>> as RDF for harvesting purposes.
>> But if you define "linked data" as exposing metadata + actual data, you
>> need a triple store, which CKAN currently does not provide. I'm not aware
>> of an extension that does that, but I remember a talk at CKANCon some
>> years ago about that topic. Maybe someone else has more details.
>>
>> Another take on this is exposing your data as "structured data" (JSON-LD)
>> so your favourite search engine has more information about your datasets. I
>> wrote a blogpost about this a while ago (
>> https://www.liip.ch/en/blog/make-open-data-discoverable-for-search-engines)
>> and you can find it in the README of ckanext-dcat as well (
>> https://github.com/ckan/ckanext-dcat/blob/master/README.md#structured-data-and-google-dataset-search-indexing
>> )
>>
>>
>> 4. What are the different functionalities in which linked data can make
>>> impacts?
>>>
>>
>> Again this is not related to CKAN, but generally Linked Data helps to
>> connect your data to others. With SPARQL you have a powerful query language
>> and with federated queries you can get answers based on several data
>> sources (e.g. Wikidata, a statistic office and yourhown data).
>>
>>
>> Hope this helps.
>>
>> - Stefan
>>
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> --
> P.S. I'd love to see your support of open data in Ethiopia (and the CKAN
> project) via a small donation here:
> https://www.gofundme.com/ethiopia-needs-open-data-experts
>
> *STEVEN DE COSTA *|
> *EXECUTIVE DIRECTOR*www.linkdigital.com.au
>
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