Dear Katie, DBpedia mostly uses descriptive URIs that are based on the titles of Wikipedia articles in a specific language. These URIs change if pages are renamed, but for many concepts, this does not occur so often. You would probably only notice it if you are using the URIs for several years.
If you instead want to use numeric IDs based on Wikipedia pages (or DBpedia URIs), you can take them from Wikidata. These IDs are stable, but not descriptive. They are kept unique in that they can only be deleted but not reused. For example, http://dbpedia.org/page/Solar_System is currently the same as https://www.wikidata.org/entity/Q544. The Wikidata URI uses content negotiation to redirect you to the HTML page if you open it in a browser, and to RDF if you open it with an RDF crawler. See https://www.wikidata.org/wiki/Wikidata:Data_access for direct links to the RDF content. To manually find out what the Wikidata ID is for a Wikipedia page, you can go to the Wikipedia page and use the link to "Wikidata item" on the left. To do this in an automated fashion, you can use the SPARQL endpoint, e.g., with the query SELECT * WHERE { <https://en.wikipedia.org/wiki/Solar%20System> schema:about ?item . } (try it in the Wikidata SPARQL UI: http://tinyurl.com/jlk4fz2) The Wikidata Web API can also map page titles to IDs for you prefer JSON over SPARQL: https://www.wikidata.org/w/api.php?action=wbgetentities&format=json&sites=enwiki&titles=Solar+System&props= Each of these methods can also be used to fetch many IDs at once. So basically it is fairly straightforward to translate from DBpedia URIs to Wikidata URIs. The mapping between the two changes over time only when DBPedia URIs change their meaning (e.g., if "Solar System" is renamed to "Solar System (astronomy)" or something). Best regards, Markus On 26.05.2016 20:43, Katie Frey wrote: > Hello, > > How are concept IDs handled for DBpedia? It looks like the concept URIs > are descriptive (i.e. for the concept > http://dbpedia.org/page/Solar_System, the concept ID is > "Solar_System"). Are the descriptive IDs used throughout all of dbpedia > (back and front end) or are terms ultimately kept unique by using > numeric identifiers? > > I've been developing a controlled vocabulary and I would also like to > use URIs so that my terms can be used with other linked data schemes. > My group and I have had a lot of discussions regarding the concept IDs; > some want them to be descriptive, based on the preferred term for each > concept so that they are human readable but this could cause problems if > the terms used to describe each concept change over time, others want > them to be randomly generated so that if the description of a term > drifts over time the URI for the concept will always remain static. > > We are trying to figure out if there are any standards or best practices > we should be looking towards when it comes to concept IDs. Any > thoughts/comments/justifications would be appreciated. > > Best, > Katie > > -- > Katie E. Frey > John G. Wolbach Library, Harvard-Smithsonian Center for Astrophysics > 60 Garden Street, MS-56, Cambridge, MA 02138 > email: kf...@cfa.harvard.edu <mailto:kf...@cfa.harvard.edu> | phone: > 617-496-7579 <tel:617-496-7579> > http://astrothesaurus.org | http://library.cfa.harvard.edu/ > > "Surprising what you can dig out of books if you read long enough, isn’t > it?" > - Rand al'Thor (in Robert Jordan's The Shadow Rising, Book Four of the > Wheel of Time) > > "This is insanity!" "No, this is scholarship!" > - Yalb and Shallan (in Brandon Sanderson's Words of Radiance, Book Two > of the Stormlight Archive) > > > ------------------------------------------------------------------------------ > Mobile security can be enabling, not merely restricting. Employees who > bring their own devices (BYOD) to work are irked by the imposition of MDM > restrictions. Mobile Device Manager Plus allows you to control only the > apps on BYO-devices by containerizing them, leaving personal data untouched! > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > > > > _______________________________________________ > Dbpedia-discussion mailing list > Dbpedia-discussion@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > -- Markus Kroetzsch Faculty of Computer Science Technische Universität Dresden +49 351 463 38486 http://korrekt.org/ ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
