protected Operator createOperator(Class<? extends Operator> clazz, Item content) throws Exception {
// get some class names...
String newClassName = clazz.getSimpleName();
// get the chosen operator...
Operator newOp = null;
try {
if(newClassName.endsWith("RDFTerm") && !(content instanceof DummyItem)) {
newOp = clazz.getDeclaredConstructor(Prefix.class, Item.class).newInstance(this.prefix, content);
}