I would instead say that the reason here is an incorrect mapping. I don't see how mapping things with a Controllo_di_autorità template was ever sufficient or current.
But what can one do with DBpedia 2016-10? If I found three different incorrect mappings in three different languages just by looking at two nodes, how many incorrect mappings are there in this DBpedia? How can I get a reasonably large amount of information from DBpedia 2016-10 that isn't likely to have these kinds of errors? It sticking to the English mappings necessary? Is this even adequate? To get less incorrect information in DBpedia in the future is likely going to require quite a bit of work. I don't think that just switching to a different kind of mapping is going to help much - it should have been easy to determine that the template mapping here was incorrect. peter On 09/22/2017 07:36 AM, Markus Freudenberg wrote: > The reason for this are insuffizient/outdated mappings. > > For example: > <http://it.dbpedia.org/resource/Arti_visive> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> > <http://dbpedia.org/ontology/Person> . > (should be owl:Thing or missing all together) > > The wikipedia template used for https://it.wikipedia.org/wiki/Arti_visive is > 'Controllo_di_autorità' > The mappings wiki states: 'Controllo_di_autorità' is to be mapped to > dbo:Person: > http://mappings.dbpedia.org/index.php/Mapping_it:Controllo_di_autorità > <http://mappings.dbpedia.org/index.php/Mapping_it:Controllo_di_autorit%C3%A0> > > To resolve this, change these template mappings. > > Way forward: > > 1. switch to RML mappings (in October - easier to validate) > 2. automate the creation of template (stumps), based on similar templates in > other languages > 3. DBpedia fusion and type generation heuristics > > Sorry, don't have time to expand on this today. > > Best, > > Markus Freudenberg > > Release Manager, DBpedia <http://wiki.dbpedia.org> > > On Thu, Sep 21, 2017 at 6:03 PM, Peter F. Patel-Schneider > <pfpschnei...@gmail.com <mailto:pfpschnei...@gmail.com>> wrote: > > When I created a KB out of what I thought should be the high-quality > information in the canonicalized 2016-10 dataset of DBpedia I noticed that > there are some systematic errors in the types of nodes. For example, > Tree, > http://wikidata.dbpedia.org/resource/Q10884 > <http://wikidata.dbpedia.org/resource/Q10884>, is an instance of both > http://dbpedia.org/ontology/Agent <http://dbpedia.org/ontology/Agent> and > http://dbpedia.org/ontology/WrittenWork > <http://dbpedia.org/ontology/WrittenWork>, as well as a lot of other > incorrect > types. Vegetable, http://wikidata.dbpedia.org/resource/Q11004 > <http://wikidata.dbpedia.org/resource/Q11004>, has similar > problems > > I traced these errors back to the following files: > > instance_types_wkd_uris_eo.ttl:<http://wikidata.dbpedia.org/resource/Q10884 > <http://wikidata.dbpedia.org/resource/Q10884>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Bird <http://dbpedia.org/ontology/Bird>> . > > instance_types_wkd_uris_it.ttl:<http://wikidata.dbpedia.org/resource/Q10884 > <http://wikidata.dbpedia.org/resource/Q10884>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Person <http://dbpedia.org/ontology/Person>> > . > > instance_types_wkd_uris_ru.ttl:<http://wikidata.dbpedia.org/resource/Q10884 > <http://wikidata.dbpedia.org/resource/Q10884>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Book <http://dbpedia.org/ontology/Book>> . > > instance_types_wkd_uris_eo.ttl:<http://wikidata.dbpedia.org/resource/Q11004 > <http://wikidata.dbpedia.org/resource/Q11004>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Bird <http://dbpedia.org/ontology/Bird>> . > > instance_types_wkd_uris_it.ttl:<http://wikidata.dbpedia.org/resource/Q11004 > <http://wikidata.dbpedia.org/resource/Q11004>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Person <http://dbpedia.org/ontology/Person>> > . > > instance_types_wkd_uris_ru.ttl:<http://wikidata.dbpedia.org/resource/Q11004 > <http://wikidata.dbpedia.org/resource/Q11004>> > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> > <http://dbpedia.org/ontology/Book <http://dbpedia.org/ontology/Book>> . > > I then looked at instance_types_it.ttl and noticed that there were a lot > of > incorrect instances of http://dbpedia.org/ontology/Person > <http://dbpedia.org/ontology/Person>. From looking at > the first few lines of the file with this type it appears that a large > majority of them are incorrect. It thus appears that something has gone > very wrong in the extraction of information for Italian DBpedia. > Similarly > it appears that something has gone very wrong in the extraction of > information for [Spanish] DBpedia. I can't make sense of the analogous > file in Russian DBpedia, but it appears to have far too many instances of > Book indicating that there is something very wrong there as well. > > The large number of errors that I have uncovered means that I can't count > on > information from these parts of DBpedia. That's regrettable, as I would > like to include as much information as possible. But what is really > problematic is that now I don't see how I can count on any DBpedia > information. > > What is the way forward here? Are there some parts of DBpedia that are > known not to have these sorts of systematic problems. > > > Peter F. Patel-Schneider > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > DBpedia-discussion mailing list > DBpedia-discussion@lists.sourceforge.net > <mailto:DBpedia-discussion@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > <https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion> > > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ DBpedia-discussion mailing list DBpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
