Editing Upgrading Bazaar Packages (How it Works) (section)

==Stage 5 - Upgrade==

This stage enables the epm, installing the repository files and calling a full reload. 

Before it does this reload, the current counters and datasets are retrieved from the running config. '''This is the config that was running before Stage 1, before this whole process started''', thus it will list datasets installed by the old epm. 

A reload is then done and the old datasets and counters are compared to those required now. Any changes are then applied.

If fields and counters have been added, these are added.
If fields and counters have been removed, '''these are removed'''.

This means an upgrade will work and '''not delete data'''

'''Note:''' If the repository object does not have any knowledge of orphaned data in the database then it won't delete it as this will not appear as a change. No knowledge before = No knowledge now = no change.