Demonstrates the use of Adder#graph correctly adds a Rule to the database

RuleExample.java

	@Test
	public void ruleExample() throws Exception {
		final String aRule = "PREFIX :<urn:test:>\n" +
		                     "      IF {\n" +
		                     "            ?r a :Rectangle ;\n" +
		                     "               :width ?w ;\n" +
		                     "               :height ?h\n" +
		                     "            BIND (?w * ?h AS ?area)\n" +
		                     "          }\n" +
		                     "      THEN {\n" +
		                     "              ?r :area ?area\n" +
		                     "          }";

		final String aData = "PREFIX rule: <tag:stardog:api:rule:>\n" +
		                     "PREFIX : <urn:test:>\n" +
		                     "\n" +
		                     ":c a :Circle ;\n" +
		                     "   :radius 10 .\n" +
		                     "\n" +
		                     ":t a :Triangle ;\n" +
		                     "   :base 4 ;\n" +
		                     "   :height 10 .\n" +
		                     "\n" +
		                     ":r a :Rectangle ;\n" +
		                     "   :width 5 ;\n" +
		                     "   :height 8 .\n" +
		                     "\n" +
		                     ":s a :Rectangle ;\n" +
		                     "   :width 10 ;\n" +
		                     "   :height 10 .";

		Connection aConnection = ConnectionConfiguration.to("mem")
		                                                .credentials("admin", "admin")
		                                                .reasoning(true)
		                                                .connect();

		final String aQuery = "select ?x ?area where { ?x <urn:test:area> ?area }";
		try {
			aConnection.begin();
			aConnection.add().io()
			           .format(RDFFormat.TURTLE)
			           .stream(new ByteArrayInputStream(aData.getBytes(Charsets.UTF_8)));
			aConnection.commit();


			assertEquals(0, AdunaIterations.size(aConnection.select(aQuery).execute()));

			aConnection.begin();
			aConnection.add().graph(ExpressionFactory.rule(aRule).graph());
			aConnection.commit();

			assertEquals(2, AdunaIterations.size(aConnection.select(aQuery).execute()));
		}
		finally {
			aConnection.close();
		}
	}