version numbers for classes in ClassDef

Chris Jillings (chris@owl.phy.queensu.ca)
Wed, 23 Sep 1998 14:32:54 -0400 (EDT)


Hello,
We may need to use the version number in ClassDef. We have have a data
structure that contains classes defined with ClassDef(ClassName,1). I want
to expand the data in the class but still be able to read the data already
written.
Is there a doc which explain how to do this? The InputOutput.html
indicates it is possible but doesn't explain how to make both versions
accessible to the linker.

Thank you,

Chris

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