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OAI-PMH feeds typically consist of a large amount of data. For most queries, you will likely need to use the resumption tokens to get the entire data set. One can use the Resume link or copy and paste the resumptionToken string into the query to continue pulling results.
Challenges
The out of the box OAI service defaults to Dublin Core. Additional metadata fields will not show up in the Blacklight feed unless custom development work is done. In Hyku, the oai_hyku prefix has been added by SoftServ, and the process for adding additional customized metadata fields is simplified in the code. Documentation for how to map to schemas other than DC is lacking.
When using the oai_dc feed, thumbnails are not included. Development work is needed to pull thumbnails into the feed. In terms of Hyrax, Lafayette College and The Ohio State University Libraries provide the thumbnail link in the dc:identifier field as [repository url/]downloads/[file id]?file=thumbnail . This is provided by pulling the thumbnail_path_ss from SOLR.
Example: https://library.osu.edu/dc/downloads/7h149s49p?file=thumbnail
In Hyku, Hyku for Consortia/Hyku Commons provides the thumbnail link in its custom oai_hyku format in the thumbnail_url field.
Example: https://au-archives.hykucommons.org/downloads/5d20d75f-0744-4f81-bcb0-998b1ff08e70?file=thumbnail
Some version upgrades are not backwards compatible with existing OAI-PMH code. For example, code written for Hyrax version 2 is incompatible with Hyrax version 3.
Examples in the Samvera community
Oregon Digital:
https://github.com/OregonDigital/oregondigital/wiki/OAI-Documentation
Base URL: http://oregondigital.org/catalog/oai?verb=Identify
Note: The GitHub documentation is out-of-date but provides other useful insights.
Hyku Commons (Hyku):
Base URL: https://TENANT.hykucommons.org/catalog/oai?verb=Identify
Example: https://au-archives.hykucommons.org/catalog/oai?verb=Identify
Shared Research Repository (Hyku)
Base URL: https://iro.bl.uk/catalog/oai?verb=Identify
Carleton University (Hyrax)
Base URL: https://repository.library.carleton.ca/catalog/oai?verb=Identify
Duke University (Hyrax)
Base URL: https://research.repository.duke.edu/catalog/oai?verb=Identify
Lafayette College (Hyrax)
Base URL: https://ldr.lafayette.edu/catalog/oai?verb=Identify
National Institute for Materials Science (Hyrax)
Base URL:https://mdr.nims.go.jp/catalog/oai?verb=Identify
The Ohio State University Libraries (Hyrax)
Base URL: https://library.osu.edu/dc/api/oai?verb=Identify
Note: This repository uses api rather than catalog in the repository’s URL.
Northwestern University Libraries (custom application):
Base URL:https://api.dc.library.northwestern.edu/api/v2/oai?verb=Identify
Note: implemented as an AWS Lambda using the node runtime as a part of our public digital collections API https://github.com/nulib/dc-api-v2/blob/main/src/handlers/oai.js
University of North Carolina at Chapel Hill (Hyrax)