title: SPARQL in DBpedia return no results
body: <p>I try to write a query in SPARQL in DBpedia to return all the info for high schools in a certain country. I run the query on snorql here <a href="http://dbpedia.org/snorql/" rel="nofollow">link</a>, but it returns "no results". I cannot find any error on my query. Can anyone help?</p>
  
  <pre><code>SELECT ?school
  WHERE { 
  ?school a owl:school. 
  ?school owl:location ?city. 
  ?city owl:isPartOf ?state. 
  ?state owl:country &lt;http://dbpedia.org/resource/United_States&gt;.
  }
  </code></pre>
  
  <p>Edit:</p>
  
  <ol>
  <li><a href="http://dbpedia.org/ontology/school" rel="nofollow">http://dbpedia.org/ontology/school</a></li>
  <li><a href="http://dbpedia.org/ontology/location" rel="nofollow">http://dbpedia.org/ontology/location</a></li>
  <li><a href="http://dbpedia.org/ontology/country" rel="nofollow">http://dbpedia.org/ontology/country</a></li>
  </ol>