public Variable caseNullConstant(NullConstant v, Object question) {
Variable dest = makevar();
//cfg.addStatement(new EmptyStm(dest, false, context.getCurrentOrigin()));
TemplateConstant cnst = new TemplateConstant("", new HashMap<String,String>(), context.getCurrentOrigin());
cnst.setXML(parseXML(cnst.getTemplate(), context.getCurrentOrigin()));
cfg.addStatement(new ConstStm(dest, cnst, context.getCurrentOrigin()));
return dest;
}