diff --git a/src/main/java/lu/jpt/csparqltest/Main.java b/src/main/java/lu/jpt/csparqltest/Main.java
index d48d8a3..e2a7007 100644
--- a/src/main/java/lu/jpt/csparqltest/Main.java
+++ b/src/main/java/lu/jpt/csparqltest/Main.java
@@ -71,7 +71,7 @@ public class Main {
 		testGeneratorThread.start();
 
 		// Now build a query to run - interchangeable
-		String query = Main.getTestPatternQuery();
+		String query = Main.getNOTA();
 		//String query = RentACarSimulation.getEventUsingBackgroundKnowledge();
 		
 		// Create a result proxy by registering the query at the engine
@@ -135,6 +135,54 @@ public class Main {
 				+ "}";
 	}
 
+	/*
+	 * WHERE {
+		OPTIONAL {
+			?eventA rdf:type <http://example.org/type/A> .
+		}
+		OPTIONAL {
+			?eventB rdf:type <http://example.org/type/B> .
+		}
+		FILTER((BOUND(?eventA) || BOUND(?eventB)) 
+			&& NOT (BOUND(?eventA) && BOUND(?eventB)))
+	}
+	 * */
+	private static String getAXORB() {
+		return "REGISTER QUERY matchAXORB AS "
+				+ "PREFIX f: <http://larkc.eu/csparql/sparql/jena/ext#> "
+				+ "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> "
+				+ "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> "
+				+ "SELECT ?atype ?btype "
+				+ "FROM STREAM <http://example.org> [RANGE 5s STEP 1s] "
+				+ "WHERE { "
+				+ " OPTIONAL { "
+				+ "  ?a a <http://example.org/type/A> . "
+				+ "  ?a a ?atype . "
+				+ " } "
+				+ " OPTIONAL { "
+				+ "  ?b a <http://example.org/type/B> . "
+				+ "  ?b a ?btype . "
+				+ " } "
+				+ " FILTER( (BOUND(?a) || BOUND(?b)) && !(BOUND(?a) && BOUND(?b)) ) "
+				+ "}";
+	}
+	
+	private static String getNOTA() {
+		return "REGISTER QUERY matchNOTA AS "
+				+ "PREFIX f: <http://larkc.eu/csparql/sparql/jena/ext#> "
+				+ "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> "
+				+ "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> "
+				+ "SELECT ?anyEventType "
+				+ "FROM STREAM <http://example.org> [RANGE 5s STEP 1s] "
+				+ "WHERE { "
+				+ " ?anyEvent a ?anyEventType . "
+				+ " OPTIONAL { "
+				+ "  ?eventA a <http://example.org/type/A> . "
+				+ " } "
+				+ " FILTER(!BOUND(?eventA)) "
+				+ "}";
+	}
+	
 	private static String getTestPatternQuery() {
 		return "REGISTER QUERY matchANotBC AS "
 				+ "PREFIX f: <http://larkc.eu/csparql/sparql/jena/ext#> "
diff --git a/src/main/java/lu/jpt/csparqltest/util/TestStreamGenerator.java b/src/main/java/lu/jpt/csparqltest/util/TestStreamGenerator.java
index ca2f3cb..d6c0472 100644
--- a/src/main/java/lu/jpt/csparqltest/util/TestStreamGenerator.java
+++ b/src/main/java/lu/jpt/csparqltest/util/TestStreamGenerator.java
@@ -37,7 +37,7 @@ public class TestStreamGenerator extends RdfStream implements Runnable {
 			);
 			
 			try {
-				Thread.sleep(100);
+				Thread.sleep(1000);
 			} catch (InterruptedException e) {
 				e.printStackTrace();
 			}