ToplevelList system = cdlDocument.getSystem();
SystemElement system = cdlDocument.getSystem();
    public void testNestedTextIsOverridden() throws Exception {        ParseContext context = new ParseContext();        CdlDocument cdlDocument = parseValidCDL(context,                CDL_DOC_EXTENDS_NON_ELEMENT_CHILDREN);        //xpath tests to verify the stuff        ToplevelList system = cdlDocument.getSystem();        PropertyList component = lookupChildPropertyList(system,                "Extension",                "");        assertElementTextContains(component, "Extension :");    }