Xml Serialization of "sub classes"

Hello,

I have a question on how to use XML serialization. As I have the following construction of classes:

 public class MainClass
 {
 public int someInt;
 public SubClass1[] object1;
 }
 
 public class SubClass1
 {
 public int someInt;
 public SubClass2[] object1;
 }
 
 public class SubClass2
 {
 public int someInt;
 public int someOtherInt;
 }

So if I want to serialize the MainClass. Could I just [XmlAttribute] and [XmlArray] over each variable, as well as [XmlRoot] over each Class and then the rest will be done by the serialization process?

Or do I only need to place one XmlRoot over the Main class?

Or will this not work at all and I need to Save each class by its own?