public boolean exit(SelectorNode parentSelector) {
SelectorNode parentSelectorClone = parentSelector.clone();
// Add the current selector from the nested rule set to the cloned selector node from the parent.
// SelectorNode listens for additions of other SelectorNodes, and will absorb its children properly.
parentSelectorClone.addChild(selector.clone());
// Add the new selector to the selector group
selectorGroupIterator.add(parentSelectorClone);
return true;
}