Hi!
As part of our Wikidata Query Service setup, we maintain the namespace serving DCAT-AP (DCAT Application Profile) data[1]. (If you don't know what I'm talking about you can safely ignore the rest of the message).
Recent check showed that this namespace is virtually unused - over the last two months, only 3 query per month were served from that namespace, and all of them coming from WMF servers (not sure whether it's a tool or somebody querying manually, did not dig further).
So I wonder if it makes sense to continue maintaining this namespace? While it does not require very significant effort - it's mostly automated - it does need occasional attention when maintenance is performed, and some scripts and configurations become slightly more complex because of it. No big deal if somebody is using it, that's what the service is for, but if it is completely unused, no point is spending even minimal effort on it, at least on main production servers (of course, it'd be possible to set up a simple SPARQL server in labs with the same data).
In any case, RDF dcatap data will be available in https://dumps.wikimedia.org/wikidatawiki/entities/dcatap.rdf, no change is planned there, but if the namespace is phased out, the data could no longer be queried using WDQS. One could still download it and, since it's a very small dataset, use any tool that can read RDF to parse it and work with it.
I'd like to hear from anybody interested in this whether they are using this namespace or plan to use it and what for. Please either answer here or even better in the task[2] on Phabricator.
[1] https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#DCAT-AP [2] https://phabricator.wikimedia.org/T228297
Stas Malyshev, 29/07/19 04:14:
As part of our Wikidata Query Service setup, we maintain the namespace serving DCAT-AP (DCAT Application Profile) data[1].
How many of the endpoints we federate with support DCAT-AP? I suppose federated queries may benefit the most from it.
DCAT-AP is allegedly taking off and it's given great importance for instance in the EU Open data maturity ranking https://www.europeandataportal.eu/en/highlights/measurement-open-data-maturity-europe: Italy, which is otherwise a laggard on open data, was scored high because its national portal embraced DCAT-AP.
Federico
Great to see ideas envisioned in one paper [1] such as data catalogs and KNS (Knowledge Name Services) being implemented on major knowledge graphs and having a profound impact on publishing and querying data on the Web.
[1] https://ieeexplore.ieee.org/document/7889519
:-)
On Mon, Jul 29, 2019 at 9:03 AM Federico Leva (Nemo) nemowiki@gmail.com wrote:
Stas Malyshev, 29/07/19 04:14:
As part of our Wikidata Query Service setup, we maintain the namespace serving DCAT-AP (DCAT Application Profile) data[1].
How many of the endpoints we federate with support DCAT-AP? I suppose federated queries may benefit the most from it.
DCAT-AP is allegedly taking off and it's given great importance for instance in the EU Open data maturity ranking < https://www.europeandataportal.eu/en/highlights/measurement-open-data-maturi...:
Italy, which is otherwise a laggard on open data, was scored high because its national portal embraced DCAT-AP.
Federico
Wikidata mailing list Wikidata@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata
Hi!
As part of our Wikidata Query Service setup, we maintain the namespace serving DCAT-AP (DCAT Application Profile) data[1]. (If you don't know what I'm talking about you can safely ignore the rest of the message).
Following up on this discussion and the feedback received, I have decided to move dcatap namespace to separate endpoint - https://dcatap.wmflabs.org/. I've updated the manual to reflect it[1]. The old setup is still working, but we'll be disabling updates, and eventually also disable the namespace itself, so while it still be used for now, if you plan to use it (logs suggest there's virtually no usage now, but that can change of course) please use the endpoint above.
[1] https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#DCAT-AP