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Comment: Initial requirements

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Warning
titleAIP Backup & Restore functionality only works with the Latest Version of Items

If you are using the AIP Backup and Restore functionality to backup / restore / migrate DSpace Content, you must be aware that the "Item Level Versioning" feature is not yet compatible with AIP Backup & Restore. Using them together may result in accidental data loss.  Currently the AIPs that DSpace generates only store the latest version of an Item.  Therefore, past versions of Items will always be lost when you perform a restore / replace using AIP tools.

Initial Requirements

The Item Level Versioning implementation in DSpace 3.0 builds on following requirements identified by the stakeholders who supported this contribution. Initial Requirements Analysis

  1. What should be Versionable
    1. Versioning happens
    What is Versionable
    1. Versioning is at the level of an Individual Item
    2. Should Versioning should preserve the current state of metadata, bitstreams and resource policies attached to the item.
  2. Access, Search and Discovery
    1. Only the most recent version of an item is available via the search interface
    2. Previous Versions versions of Items should continue to be visible, citable and accessible 
    3. The Previous Versions Bitstreams for previous versions are retained. If something was once retrievable, it is should always be retrievable.
  3. Identifiers
    1. Each version of an Item is represented by a separate "versioned" identifier
    2. A base "versionhistory" Identifier points to the most recent version of the Item. 
    3. A revision identifier also exists that is unique to the specific version.
    4. When a new version of an Item is deposited, a new revision identifier will be created.
  4. Presentation
    1. On the item page, there is a link to view previous/subsequent versions.
    2. By examining the metadata or identifiers, it is possible to determine whether an item is the most recent version, the original version, or an intermediate version.
  5. Access Control and Rights
    1. Certain roles should be able to generate a new version of the item via submission.
    2. To submitters, collection manager, administrators will be given to option to create new version of an  item.
    3. Rights to access a specific Item should transmute as well to previous versions
    4. Rights to access a specific Bitstream should also transmute to previous versions.
  6. Data Integrity
    1. The relationships between versions should not be brittle and breakable by manipulating Item metadata records.
    2. The relationships between versions should be preserved and predictable in various Metadata Exports (OAI, Packagers, ItemExport)
    3. The relationships between versions should be maintained in SWORD, LNI and AIP packaging and be maintained in updates and restorations.

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