std::set<std::shared_ptr<ModelAPI_Feature> > aRefFeatures;
aRoot->refsToFeature(aFeature, aRefFeatures);
if (aRefFeatures.empty()) {
std::set<std::shared_ptr<ModelAPI_Feature> > aRefFeatures;
aRoot->refsToFeature(aFeature, aRefFeatures);
if (aRefFeatures.empty()) {