graph types for attaching positions (X,Y) to nodes

src/de/tudarmstadt/maki/simonstrator/api/component/sis/type/SiSTypes.java

@@ -55,6 +55,9 @@ public final class SiSTypes {
 	public static final SiSType<Location> PHY_LOCATION = create("PHY_LOCATION",
 			Location.class, null);
 
+	public static final SiSType<Double> POSITION_X = create("LOCATION_X", Double.class, null);
+	public static final SiSType<Double> POSITION_Y = create("LOCATION_Y", Double.class, null);
+
 	/**
 	 * [none] Just a dummy Test attribute of type double. Do not use in
 	 * production code.