public Map<String, String> getFilteredPowerSet(Set<String> usedFeatures)
			throws FeatureTypeNotFoundException {
		Map<String, String> newFeatures = new HashMap<String, String>();
		for (String usedFeature : usedFeatures) {
			newFeatures.put(usedFeature, getFeatureValue(usedFeature));
		}
		return newFeatures;
	}