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Summary
The Fedora 4.5.0 1 release furthers several major objectives:
- Tighten the definition of the RESTful application programming interface (API)
- Improving the Versioning capability
- Further align this API to community standards, including the Linked Data Platform [3] (LDP) and Web Access Control [4] (WebAC)
- Enhance preservation capabilities and related documentation
- Improve tooling for external services in the ecosystem around the repository
- Fix bugs
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This release is a major release (i.e. 4.5.0 instead of 4.4.1) because there are a several REST API updates that are not backwards compatible with 4.4.0. The theme of these updates is the removal of JCR-related properties that have heretofore been leaked from the Fedora API in the RDF returned to users. Fedora 4 is in no way dependent on JCR, and any mention of JCR found in RESTful responses will be removed. No client code should require updating for this release unless it contains dependencies on JCR-namespaced properties.
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Application Programming Interface
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Application Programming Interface
One of the technical priorities [5] of Fedora is to define a well-specified application programming interface (API) against which client applications can be written and future server-side implementations can be created. This Fedora API should be clear and detailed enough such that a corresponding technology compatibility kit [6] (TCK) would be able to indicate if any Fedora implementation fulfills or diverges from the specification. With this in mind, several issues were addressed in this release that clean up Fedora's RESTful interaction.
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Performance
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Versioning
This release includes several bug fixes related to versioning:
- Resolves error encountered when GETting a version of a container that itself has versioned child resources
- Resolves error encountered when GETting a version of a container that had a deleted child resource
- Resolves inability to see description of binary resource versions
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Additional documentation of Fedora's implementation of Web Access Controls is available on the the wiki [13].
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Versioning
This release includes several bug fixes related to versioning:
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Performance
One of Fedora's perennial goals is "improved performance". With this as a focus, a Performance and Scalability working group [] has progressed in the creation of repeatable, scripted tests that exercise and meter basic read/write operations. The objective of these tests is to reveal application bottlenecks and to track changes in performance as the reference Fedora implementation evolves.
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Housekeeping and Bugfixes
Numerous refactorings, bugfixes, and clean-up tasks were addressed in this release:
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