Hello,

I have the following problem. Currently I'm porting an application from
OpenSG 1.8 to OpenSG 2.0. Simuntanously, I'm bringing it into a 64Bit
compatible state. 

Now I have encountered the case, that I have once written an Attachement
derived class which just holds an multi field of type UInt32. You may
expecting it already, this field contains application specific pointer
information. I should have gone with an UInt64 multi field in the first
place and would now not ask this question. 
Is there any possibilty to change this class so that is uses UInt64
instead of UInt32 for the multi field? 
Is there any versioning mechanism I could use so that I could read old
models written with the UInt32 implementation without corrupting the
stream? 

I know that I could clean the situation by introducing a new Attachment
derived class and convert my old models after reading. But I would like
to go for a solution intrinsic to the already established class.

With best regards,
Johannes



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