DSpace Item Level Versioning Support

Introduction

DSpace Item Level Versioning Support is a funded open source activity to bring work done by NESCent and @mire into the DSpace 3.0 Codebase.  Additional partners have signed onto this activity to assure that resources are available to drive Item Versioning Support forward and make it available to the larger DSpace community in the next release.

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Key Stakeholders involved with Item Versioning Support:

• Mark Diggory - @mire
• Holly Miller - MBL
• Diane Rielinger - MBL
• Lisa Raymond - WHOI 
• Ryan Scherle - NESCent / Dryad

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Edit Item and Version Management

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\[TODO\]

Technical Requirements and Existing Implementation

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The versioning support in Dryad is based on replicating DSpace Item, MetadataValue and Bundle Records, creating an identical version of all Metadata and Bitstream relationships. The new version of the Item "conserves" “conserves” Bitstream Contents by reusing references to the persisted Bitstreams across individual Item Revisions. 

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The Versioning Service will rely on a generica generic IdentifierService that is described below for minting and registering any identifiers that are required to track the revision history of the Items.

Dryad Example: Version 1, Version 2 of same document (see versions listed at bottom of page)

Code: Google Code

public interface VersioningService {

    Version createNewVersion(Context c, int itemId);

    Version createNewVersion(Context c, int itemId, String summary);

    void removeVersion(Context c, int versionID);

    void removeVersion(Context c, Item item);

    Version getVersion(Context c, int versionID);

    Version restoreVersion(Context c, int versionID);

    Version restoreVersion(Context c, int versionID, String summary);

    VersionHistory findVersionHistory(Context c, int itemId);

    Version updateVersion(Context c, int itemId, String summary);

    Version getVersion(Context c, Item item);

}

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1. Resolution: IdentifierService act in a manner similar to the exisitng HandleManager in DSpace, allowing for resolution of DSpace Items from provided identifiers.
2. Minting: Minting is the act of reserving and returning an identifier that may be used with a specific DSpaceObject.
3. Registering: Registering is the act of recording the existence of a minted identifier with an external persistent resolver service, these services may reside ont he local machine (HandleManager) or exist as external services (PURL or DEZID DOI registrations services)

Dryad Example: The same document can be accessed via different identifiers: DOI link (http://dev.datadryad.org/resource/doi:10.5061/dryad.1385.2), Handle link (http://dev.datadryad.org/resource/info:hdl/10255/dryad.36265), default DSpace Link (http://dev.datadryad.org/resource/10255/dryad.36265)

Code: Google Code

Application IdentifierService Interface

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