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If you are upgrading from an earlier version of DSpace, you will need to be aware that many configuration names/keys have changed. Because Apache Commons Configuration allows for auto-overriding of configurations, all configuration names/keys in different *.cfg files MUST be uniquely named (otherwise accidental, unintended overriding may occur).

In order to compensate for thiscreate this powerful ability to override configurations in your local.cfg, all modules/*.cfg files had their configurations renamed to be prepended with the module name.  As a basic example, all the configuration settings within the modules/oai.cfg configuration now start with "oai.".

Additionally, while the local.cfg may look similar to the old build.properties, many of its configurations have slightly different names. So, simply copying your build.properties into a local.cfg will NOT work.

This means that DSpace 5.x (or below) configurations are NOT guarranteed compatible with DSpace 6 .  While you obviously can use your old configurations as a reference, you will need to start with fresh copy of all configuration files, and reapply any necessary configuration changes (this has always been the recommended procedure). However, as you'll see below, you'll likely want to do that anyways in order to take full advantage of the new local.cfg file.