Hydra (digital repository)
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| Operating system | Cross-platform |
|---|---|
| Type | Digital libraries |
| License | Apache License 2.0 |
| Website | projecthydra |
Hydra is an open-source digital repository software product. Hydra's main components are Fedora Commons, Solr, Blacklight, and HydraHead (a Ruby on Rails plugin and gem, respectively). Each Hydra implementation is called a "Hydra head".
The project was launched in 2009. The software was developed as a collaboration between Stanford University, the University of Virginia, the University of Hull, and Fedora Commons. The stated goal of the project was to "support the rapid development of multiple systems tailored to distinct needs, but powered by a common underlying repository."
There are three governance bodies. The original collaborators, plus some newer members, form the Hydra Steering Group. That group oversees legal and administrative aspects of the project. A second body is made up of institutional partners. Over two dozen institutions are formal partners. The Hydra developers group is the third group and is made up of contributors to the Hydra software.
Hydra is primarily used in libraries and digital repositories. It was originally developed to make use of metadata defined by the Library of Congress's Metadata Object Description Schema (MODS) standard. Hydra implements the Opinionated Metadata gem to create Domain-specific languages out of complex XML standards such as MODS. Other metadata standards, such as Dublin Core and Encoded Archival Description (EAD) are known to be employed in Hydra implementations.
Hydra allows storage of any type of digital files for the purposes of access and/or digital archiving. It is suited to both large and small collections, and is being used in some cases to allow faculty and researchers to self-deposit their own digital research materials.
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