DataField <-> Class

Hi,
Can i have a process which has datafields which are actually objects of classes defined in the code module of the K2 solution? If not, what would be a turnaround way to logically group related varaibles in a K2 Process?

I dont want to go for XML data fields, because extracting data from them would involve an unnecessary parsing time.

Thx a lot in advance.

Regards,
Shortwire