Desserialize a Custom Class that had its structure changed

Hi experts.

Suppose that I have a Class that defines a Product in my catalog. This class have 2 attributes: Product_Code and Product_Description, both as string.

A instance of this class was serialized as XML and saved to the disk.

Now, suppose that a new attribute, called Product_Supplier was added to the class. What will happen if I try to deserialize the XML file that was previously saved? Is there a way to perform this action sucessfully, including when attributes are deleted or have it's names changed?

Thanks a lot.