void (@NotNull Element element) { List<Element> subPanes = element.getChildren(ELEMENT_SUB_PANE); for (Element subPane : subPanes) { String subId = subPane.getAttributeValue(ATTRIBUTE_SUB_ID); TreeState treeState = TreeState.createFrom(subPane); if (!treeState.isEmpty()) { myReadTreeState.put(subId, treeState); } } }