Question: Which states border Illinois?
SPARQL:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string 
WHERE {
      res:Illinois dbp:borderingstates ?uri .
      OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') . }
}