Compare both requests :
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea
==> OK !
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea&QueryClass=SpatialThing
==> empty result !
If you are curious, my use case is the following in https://github.com/jmvanel/semantic_forms :
- from the rdfs:range of foaf:based_near ( that is geo:SpatialThing ) an input field is generated with dpPedia completion
- after user typed "Bordea" , the above request is sent by JavaScript
NOTE : that works:
http://lookup.dbpedia.org/api/search/PrefixSearch?QueryString=Bordea&QueryClass=Place