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Describe inventory consistency between versions #425

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8 changes: 8 additions & 0 deletions draft/spec/index.html
Original file line number Diff line number Diff line change
Expand Up @@ -834,6 +834,14 @@ <h2>Version Inventory and Inventory Digest</h2>
most recent version. Every inventory file MUST have a corresponding <a href="#inventory-digest">Inventory
Digest</a>.
</p>
<p>
In the case that prior version directories include an inventory file there will be multiple inventory
files describing prior versions within the OCFL Object. Each version block in each prior inventory file
MUST represent the same object state as the corresponding version block in the current inventory file.
Additionally, the values of the <code>created</code>, <code>message</code> and <code>user</code> keys in
each version block in each prior inventory file SHOULD have the same values as the corresponding keys in
the corresponding version block in the current inventory file.
</p>
<blockquote class="informative">
Non-normative note: Storing an inventory for every version provides redundancy for this critical
information in a way that is compatible with storage strategies that have immutable version directories.
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