The reason for this are insuffizient/outdated mappings.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
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> 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, is an instance of both
> http://dbpedia.org/ontology/Agent and
> http://dbpedia.org/ontology/WrittenWork, as well as a lot of other
> incorrect
> types. Vegetable, 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://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Bird> .
> instance_types_wkd_uris_it.ttl:<http://wikidata.dbpedia.
> org/resource/Q10884>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Person> .
> instance_types_wkd_uris_ru.ttl:<http://wikidata.dbpedia.
> org/resource/Q10884>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Book> .
> instance_types_wkd_uris_eo.ttl:<http://wikidata.dbpedia.
> org/resource/Q11004>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Bird> .
> instance_types_wkd_uris_it.ttl:<http://wikidata.dbpedia.
> org/resource/Q11004>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <http://dbpedia.org/ontology/Person> .
> instance_types_wkd_uris_ru.ttl:<http://wikidata.dbpedia.
> org/resource/Q11004>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> <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. 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 Esperanto 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
>
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