features.add(new IsMissingFeature());
features.add(new NumberOfWordsBeforeFeature());
features.add(new NumberOfWordsAfterFeature());
features.add(new NumberOfWordsStemmedFeature());
features.add(new NumberOfCharsBeforeFeature());
features.add(new NumberOfCharsStemmedFeature());
features.add(new ElementDepthFeature());
features.add(new ItemNumberInParentFeature());
features.add(new NumberOfChildrenFeature());
features.add(new NumberOfDescendentsFeature());
features.add(new IsTheOnlyChildFeature());