Hi, I read the STON paper and the STON chapter in EnterprisePharo but I did not find answers to some questions: how do you tell STON to not serialize some variables of an object? is there a way to avoid the class tag? What I mean is that I would like a synthetic STON String. If a STON entry has a class tag, STON knows which class to instantiate. This class may also know which classes to instantiate for its i-var. In this case, the class tag may be omitted. Maybe I should redefine fromSton;, but in this case, is it possible to avoid a manual parsing of the string? is there a way to do an alias for an i-var (just like for the class name)? is there a way to skip the serialization of an i-var if its value is nil (or an empty collection)? Regards, Christophe.