private String nodeHtmlString(TeaNode parent) {
		String line = "<br/>|";
		for (int i = 0; i < parent.level; i++) {
			line += "-";
		}
		if (!parent.label.equals("")) {
			line += "[" + parent.label + "]";
		}
		if (parent.classValue == null) {
			line += parent.attribute;
		} else {
			line += " -> " + parent.classValue;
		}
		for (TeaNode node : parent.children) {
			line += nodeHtmlString(node);
		}
		return line;
	}