ToplevelList system = cdlDocument.getSystem();
SystemElement system = cdlDocument.getSystem();
    public void testExtendsWithinSystem() throws Exception {        ParseContext context = new ParseContext();        assertInvalidCDL(CDL_DOC_EXTENDS_WITHIN_SYSTEM,                ExtendsResolver.ERROR_UNKNOWN_TEMPLATE);        //xpath tests to verify the stuff/*        CdlDocument cdlDocument = parseValidCDL(context,                CDL_DOC_EXTENDS_WITHIN_SYSTEM);        ToplevelList system = cdlDocument.getSystem();        PropertyList component = lookupChildPropertyList(system,                "Component",                "");        PropertyList child = lookupChildPropertyList(component, "child2");        assertAttributeValueEquals(child, "size", "20");        assertElementValueEquals(child, "text");*/    }