String precedingNames = null;
String followingNames = null;
// Check if info about ordering is available
if (sid instanceof Orderable) {
Orderable orderable = (Orderable) sid;
precedingNames = orderable.getPrecedingNames();
followingNames = orderable.getFollowingNames();
}
orderer.add(sid, sid.getName(), precedingNames, followingNames);
}