Rule rule = ThemeFactory.getDefaultInstance().createRule();
SelectorSequence context = createContextualSelectorSequence(row);
Subject subject = createNthChildSelector(column);
CombinedSelector selector = factory.createCombinedSelector();
selector.setCombinator(CombinatorEnum.CHILD);
selector.setContext(context);
selector.setSubject(subject);
List selectors = new ArrayList();
selectors.add(selector);
rule.setSelectors(selectors);