public static void registerFeatures()
{
features = new Vector<Feature>();
//TODO register features
features.add(new ElementTypeFeature());
//features.add(new VerifyParents());
features.add(new IsMissingFeature());
features.add(new NumberOfWordsBeforeFeature());
features.add(new NumberOfWordsAfterFeature());
features.add(new NumberOfWordsStemmedFeature());