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

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