@Before
  public void setUp() throws Exception {
    arg1simple = f.createLiteral("abc");
    arg2simple = f.createLiteral("b");

    arg1en = f.createLiteral("abc", "en");
    arg2en = f.createLiteral("b", "en");

    arg1cy = f.createLiteral("abc", "cy");
    arg2cy = f.createLiteral("b", "cy");

    arg1string = f.createLiteral("abc", XMLSchema.STRING);
    arg2string = f.createLiteral("b", XMLSchema.STRING);

    arg1year = f.createLiteral("2007", XMLSchema.GYEAR);
    arg2year = f.createLiteral("2009", XMLSchema.GYEAR);

    arg1dateTime = f.createLiteral("2009-01-01T20:20:20Z", XMLSchema.DATETIME);
    arg2dateTime = f.createLiteral("2007-01-01T20:20:20+02:00", XMLSchema.DATETIME);

    arg1int = f.createLiteral(10);
    arg2int = f.createLiteral(1);

    arg1unknown = f.createLiteral("foo", f.createIRI("http://example.com/datatype"));
    arg2unknown = f.createLiteral("bar", f.createIRI("http://example.com/datatype"));
  }