Question: Give me all chemical elements.
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX dct: <http://purl.org/dc/terms/> PREFIX dbc: <http://dbpedia.org/resource/Category:> select distinct ?uri where { ?uri rdf:type owl:Thing . ?uri dct:subject dbc:Chemical_elements . }