incomplete result? Querying DBpedia

[Ramona Ottow]

Hi all!

 

I am wondering why there are different results while using the Data Importer and the SPARQL Explorer! Do I have to change some settings?

 

Thanks in advance!

 

My query:

 

select distinct ?subcategory
where {
  {?subcategory dct:subject dbc:Electronic_waste_in_Europe .
  FILTER (NOT EXISTS {?subcategory rdf:type ?v} )}
UNION
  {?subcategory rdf:type dbo:Company .
   ?subcategory dct:subject dbc:Electronic_waste_in_Europe .}
UNION
  {?subcategory rdf:type yago:Abstraction100002137 .
   ?subcategory dct:subject dbc:Electronic_waste_in_Europe .}
}

 

The output of SPARQL Explorer:

:Waste_Electrical_and_Electronic_Equipment_Directive

:Battery_Directive

:Restriction_of_Hazardous_Substances_Directive

The output of the Data Importer:

:Waste_Electrical_and_Electronic_Equipment_Directive

 

 

 

link to SPARQL Explorer:

http://dbpedia.org/snorql/?query=select+distinct+%3Fsubcategory%0D%0Awhere+{%0D%0A++{%3Fsubcategory+dct%3Asubject+dbc%3AElectronic_waste_in_Europe+.%0D%0A++FILTER+%28NOT+EXISTS+{%3Fsubcategory+rdf%3Atype+%3Fv}+%29}%0D%0AUNION%0D%0A++{%3Fsubcategory+rdf%3Atype+dbo%3ACompany+.%0D%0A+++%3Fsubcategory+dct%3Asubject+dbc%3AElectronic_waste_in_Europe+.}%0D%0AUNION%0D%0A++{%3Fsubcategory+rdf%3Atype+yago%3AAbstraction100002137+.%0D%0A+++%3Fsubcategory+dct%3Asubject+dbc%3AElectronic_waste_in_Europe+.}%0D%0A}

[Petar Ristoski]

Hi Ramona,

The problem is in the last "UNION" clause, where you use the prefix "yago" in "yago:Abstraction100002137". This prefix is automatically resolved in our extension to "http://yago-knowledge.org/resource/Abstraction100002137", where it should be "http://dbpedia.org/class/yago/Abstraction100002137. The simple solution is to use "<http://dbpedia.org/class/yago/Abstraction100002137>" instead of "yago:Abstraction100002137".

The complete query should look like this:

select distinct ?subcategory

where {

  {?subcategory dct:subject dbc:Electronic_waste_in_Europe .

  FILTER (NOT EXISTS {?subcategory rdf:type ?v} )}

UNION

  {?subcategory rdf:type dbo:Company .

   ?subcategory dct:subject dbc:Electronic_waste_in_Europe .}

UNION

  {?subcategory rdf:type <http://dbpedia.org/class/yago/Abstraction100002137> .

   ?subcategory dct:subject dbc:Electronic_waste_in_Europe .}

}

Regards,

Petar