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    OAI-PMH Harvester best practices

    • Product: Rosetta
    • Product Version: 5.3+

    Question

    What are the OAI-PMH Harvester best practices, limitations and known issues?

    Answer​

    Prior to setting up OAI-PMH Harvester for migration legacy repository see article on the  developer network:  

    https://developers.exlibrisgroup.com/blog/Migrating-from-Your-Legacy-Digital-Repository-to-Rosetta

    Make sure you understand the purpose of the OAI-PMH Harvester use. You can use it:  

    1. To synchronize the metadata of IEs already ingested in Rosetta with an external system:
      • Objects originating from Rosetta
      • Objects created in external system which still manage the metadata
      • From v5.3. the OAI-PMH harvester can match records by any DC or DCTERMS identifier, not only based on external origin identifier (OAI Header ID) or the Rosetta origin (dc:identifier)
      • Schedule an Update Metadata Job to perform the on-going updates
         
    2. To load new objects (files + metadata) into Rosetta for the first time:  
      • The OAI-PMH Harvester will create SIPs (Dublin Core or METS xml with metadata)
      • Use Do not match (duplicate) in Match parameter in the OAI-PMH Harvester configuration
      • When user name and password are left empty in the OAI-PMH Harvester configuration no authentication will be performed
      • The Submission job will upload the files referenced in these SIPs into Rosetta
      • File references in the SIP xml must point to an actual file (not a resolver, e.g. DigiTool's Delivery Manager).
        If using an URL, it must contain a legitimate filename.
        Note that the "Migrating Your Digital Repository to Rosetta" article includes XSL transformation examples for the dc:identifier (e.g. DSpace, DigiTool, DigitalCommons, ContentDM)
      • In the Content structure be sure to define a stream source origin (typically dc:identifier)

    Testing phase:

    • Use the OAI-PMH Harvester configuration Test area to verify the connectivity and your XSL Transformation
    • Use 'ignore last run time' checkbox when repeating test ingests
    • Test the submission job on larger sets to see if the source files can be downloaded

    Other recommendations:

    • Downloading files via http can take time.
      For larger migrations the file references in SIP xml should point to a NFS location mounted to Rosetta
    • Rosetta will access all URLs provided the SIP xml stream origin (dc:identifier).
      Be sure that there are valid objects on these URLs.
      Think about how the source system handles versioning or delete of the files.
    • Placing the set and metadata prefix configuration into the BaseURL is not recommended.
      The set and metadata prefix will be appended to the base URL from the configuration form fields.
    • Rosetta cannot harvest multiple sets at a time.

    Note: OAI Transformation xsl currently supports XSLT 1.0


    • Article last edited: 26-Nov-2018
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