public boolean isEmpty() {
		for (String s : source) {
			if (StartUtils.isArobaseStartDiagram(s)) {
				continue;
			}
			if (StartUtils.isArobaseEndDiagram(s)) {
				continue;
			}
			if (s.matches("\\s*'.*")) {
				continue;
			}
			if (s.trim().length() != 0) {
				return false;
			}
		}
		return true;
	}