What is relationship between position and actor center?

Hello, are these right?

1 - The DataSet.center is the geometric center of the object in model space;
2 - The Actor.center is the coordinates of DataSet.center in world space;
3 - Actor.SetPositon will move it to the specified position, after this operation,the Actor.center == targeted position?
4 - Actor.Position == Actor.Center or Actor.Postion == Actor.Origin(in world space)?