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During application life cycle the persisted data model can
change.
Two ways to manage this:
export from old application release and import in new application release, see export/import
change data model on the fly, during normal application
At file persistence manager creation there is two parameters for data model management:
the data model identifier of stored data model
an input stream on conversion definition.
The conversion definition gives converter to use to replace a
class with an other. The conversion is done after read an old format
object from the file.
The old object must exist in the classpath.
