for (RequestNode requestNode : graph.getNodes())
{
if (requestNode instanceof LiteralValuesNode)
{
LiteralValuesNode literal = (LiteralValuesNode)requestNode;
ProcessingElementOutputDescriptor outputDesc =
literal.getOutputDescriptor();
assertTrue(outputDesc.getSType() instanceof ListSType);
SType childType = ((ListSType)outputDesc.getSType()).getChildType();
assertTrue(childType instanceof TupleSType);
Map<String, SType> elements = ((TupleSType)childType).getElements();
SType t = elements.get("i");
assertTrue(t instanceof PrimitiveSType);
assertEquals("Element i has wrong SType,", "Integer", ((PrimitiveSType)t).getName());