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As holdings with items from Inventory will be included into the OAI-PMH feed, FOLIO should let Discovery Systems know if the holding/item record is no longer exists in the repository (was removed).
For holdings and items it is proposed to
- implement records deletion history tracking
- apply the next logic for deleted records:
If holding/item record was deleted within the requested period, instance record should be added to the response, defining the last deletion date as an update date. That is, holdings or items removal into the instance is considered as instance record update.
This feature implementation will affect Inventory somehow, as deletion history tracking hasn't been implemented yet.
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