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Approach Request – response type protocol Protocol must be asynchronous by nature Engagement of archive provider cannot be immediate, only after backup etc… Data to be restored may not be available on line. Protocol can use online transports like HTTP At least two stages: submission, confirmation Protocol used to transfer data, transfer evidence and manage data preservation activities Evidence verification details are in ERS; need to proceed carefully to make sure nothing falls between the cracks (especially if alternative evidence formats are permitted) All of this is similar to SAML |