public override void Visit(IPrefixTerm node)
        {
            if (node.Source != null)
            {
                node.Source.AcceptVisitor(this);
            }

            builder.AppendFormat("\"{0}*\"", node.Prefix.Trim());
        }
 public override void Visit(IPrefixTerm node)
 {
     throw new NotSupportedException();
 }
 public abstract void Visit(IPrefixTerm node);