public void Delete(ConcatenationD concatD)
 {
     GrammarNodeVDeleteVisitor visitor = new GrammarNodeVDeleteVisitor(concatD);
     startSymbol.accept(visitor);
 }
        public void Delete(GrammarNodeV itemToDelete)
        {
            GrammarNodeVDeleteVisitor visitor = new GrammarNodeVDeleteVisitor(itemToDelete.getReference());

            startSymbol.accept(visitor);
        }