<http://dbis.informatik.uni-goettingen.de/Teaching/SemWeb/RDF/john-local.n3#mary>
  <http://dbis.informatik.uni-goettingen.de/Teaching/SemWeb/RDF/john-local.n3#married>
  <http://dbis.informatik.uni-goettingen.de/Teaching/SemWeb/RDF/john-local.n3#john>.