import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
-import org.simantics.db.common.utils.CommonDBUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.util.Layer0Utils;
-import org.simantics.db.service.UndoRedoSupport;
import org.simantics.district.network.ontology.DistrictNetworkResource;
/**