for (DataTreeModification<Session> change : changes) {
final DataObjectModification<Session> rootNode = change.getRootNode();
final DataObjectModification.ModificationType modificationType = rootNode.getModificationType();
for (DataTreeModification<Session> change : changes) {
final DataObjectModification<Session> rootNode = change.getRootNode();
final DataObjectModification.ModificationType modificationType = rootNode.getModificationType();