docs: private static LblTree createTree(TreeWalker walker) {
  		Node parent = walker.getCurrentNode();
  		LblTree node = new LblTree(parent.getNodeName(), -1); // treeID = -1
  		for (Node n = walker.firstChild(); n != null; n = walker.nextSibling()) {
  			node.add(createTree(walker));
  		}
  		walker.setCurrentNode(parent);
  		return node;
  	}