This fixes a minor fix to 5.x-2.3 involving the cache. The 6.x caching api solution was accidentally checked into the 5.x branch. Otherwise, see the 5.x-2.3 release notes.
Installation:
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Copy the oai2 directory to your modules directory. Visit admin/modules
and enable the oai2 module, the module will report success or failure of the
installation. Visit the admin/menu page to activate (and cache) the /oai url.