@Override
public void unassigned(Assignment<V, T> assignment, long iteration, T value) {
super.unassigned(assignment, iteration, value);
getContext(assignment).unassigned(assignment, value);
}
@Override
public void setModel(Model<V, T> model) {
super.setModel(model);
if (model != null) iContextReference = model.createReference(this);
}