literal.add(tuple);
literal.add(ListMarker.END);
TupleSType stype = new TupleSType();
stype.addElement("a", new PrimitiveSType("Integer"));
stype.addElement("b", new PrimitiveSType("String"));
literal.setOutputDescriptor(new ListSType(stype), null);
ProcessingElementNode node2 = new ProcessingElementNode("2");
node2.addAnnotation(AnnotationKeys.LOCATION, mLocation);
literal.connectOutput("output", 0, node2.getInput("input", 0));
Graph graph = new Graph();
graph.add(literal);