ToplevelList system = cdlDocument.getSystem();
SystemElement system = cdlDocument.getSystem();
    public void testElementsNestedElements() throws Exception {        ParseContext context = new ParseContext();        CdlDocument cdlDocument = parseValidCDL(context,                CDL_DOC_EXTENDS_NESTED_ELEMENTS);        //xpath tests to verify the stuff        ToplevelList system = cdlDocument.getSystem();        PropertyList component = lookupChildPropertyList(system,                "Component",                "");        PropertyList nested = lookupChildPropertyList(component, "nested");        assertElementValueEquals(nested, "text");    }