@Override
	public String stringify(boolean includePositionalInfo) {
		StringBuilder s = new StringBuilder();
		s.append("(");
		produceStringRepresentation(s);
		if (includePositionalInfo) {
			s.append(":");
			s.append(getStartPos()).append(">").append(getEndPos());
		}
		s.append(")");
		return s.toString();
	}
@author Andy Clement
@author David Turanski
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/stream/dsl/ChannelNode.java