How are the values of a property derived for one entity?

Data Data Quality
1

Hi,

I would like to ask you how the values of a property are derived. Let me give you an example.
In this page (http://dbpedia.org/page/Astrological_age), the rdf:type property has a value dbo:Country. Apparently, this entity (Astrological_age) is totally irrelevant(?) to the word “country”.

So, I was just wondering how that value dbo:Country is a value of rdf:type, since as far as I know dbpedia extracts all the information from wikipedia (please correct me if I’m wrong), without being able someone to edit the information on dbpedia.org/page.

Thanks,
Thanos

2

you are right. In fact, dbpedia must be consistent with wikipedia but what we see does not reflect that. For this reason, if you want to use dbpedia as a source of information for your application, you have to clean the extracted data. However, the best solution is to edit dbpedia pages and start fixing like these errors.

3

@thanasissdr
Someone seems to have fixed this for the new release: https://dbpedia.demo.openlinksw.com/page/Astrological_age

Let me briefly give some pointers where to fix such issues:

  1. for wikipedia pages such as Donald Trump, there is an infobox Infobox officeholder which is the mapped to a class here: http://mappings.dbpedia.org/index.php/Mapping_en:Infobox_officeholder
  2. cleaning this on client side is normally easy, by using one of the plenty ontologies in DBpedia such as Yago ro the Wikipedia Categories

– Sebastian

4

Found a similar issue: https://dbpedia.org/resource/Subanon_people is dbo:insect (!!) but should be dbo:EthnicGroup.

This resource is also dbo:Country and has a country code (PH) and other ‘country’ related stuff in it.

It seems like instead, db:Subanon_people should have dbo:populationPlace db:Phillipines and then all the country stuff lives in db:Phillipines. by comparison Germans another ethnic group.

5

@srl295the issue has been fixed: https://dbpedia.demo.openlinksw.com/page/Subanon_people

The Czech chapter made a tool that added additional types extracted from hypernyms in abstracts: https://ner.vse.cz/datasets/linkedhypernyms/

Insects also live in tribes and therefore it added this inference for all peoples that live in tribes. We excluded some of the LHD datasets with low confidence, which seems to have fixed that issue.

6

I still see dbo:Insect on About: Subanon people