objects that provide bindings or links to disseminators (software processes that can be used with the datastreams). Content models can be thought of as containers that give a useful shape to information poured into them; if the information fits the container, it can immediately be used in predefined ways. Fedora supports two types of access services: a management client for ingest, maintenance, and export of objects; or via API hooks for customized web-based access services built on either HTTP or SOAP. A Fedora Repository provides a general-purpose management layer for digital objects, and containers that aggregate mime-typed datastreams (e.g., digital images, XML files, metadata). Out-of-the-box Fedora includes the necessary software tools to ingest, manage, and provide basic delivery of objects with few or no custom disseminators, or can be used as a backend to a more monolithic user interface. Fedora supports ingest and export of digital objects in a variety of XML formats. This enables interchange of objects between Fedora and other applications, as well as facilitating digital preservation and archiving. Digital Object Model The FEDORA digital object model allows aggregation of both metadata and digital content as "datastreams", regardless of format and physical location. FEDORA objects can include content from external or distributed repositories. Digital Objects can be modeled to represent many types of entities from digital texts, publications, photos, videos, and datasets. Digital objects can have associated "behaviors" that can provide different views of the object, or that can produce dynamic transformations of digital object content. Relationships The FEDORA digital object model supports the ability to assert semantic relationships using the Resource Description Framework (RDF). Relationships between objects and within objects can be indexed using a semantic triplestore that enables queries over the entire repository of digital objects. Repository Service is based upon four main Application Programming Interfaces (APIs): manage, access, search and metadata harvesting via OAI-PMH. The system is scalable and flexible and Fedora users have adopted the repository as a core component of many applications and platforms. The Fedora Project is currently supported by the DuraSpace organization. See also Content management system Digital preservation Islandora References Further reading Acs, B., et al., A general approach to data-intensive computing using the Meandre component-based framework. Wands '10 Proceedings of the 1st International Workshop on Workflow Approaches to New Data-centric Science. June 2010. Allinson, J., Feng, Y., Building flexible workflows with Fedora, the University of York approach. Open Repositories