[elephant-devel] Good practices around adding/deleting class slots.

[Yarek Kowalik]

In an evolving site there is a fair chance of adding/changing/deleting slots
from a class.  What are good practices with respect to these actions in
Elephant?  Are there specific steps that need to be taken to migrate data
from an old class definition to a new class definition?  Any gotchas one
needs to be aware of?

BTW, I've read several emails about data migration going by, can someone
please clarify what exactly "data migration" is?  Is it migrating between
stores, or different versions of a class?

Yarek
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