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This provides a unified "graph" of all the objects in the repository and their relationships to each other. The Resource Index graph can be queried using RDQL or ITQL which are SQL-like query languages for RDF. The Fedora repository service exposes a web service interface to search the Resource Index. Please refer to the Resource Index documentation for details.

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5: The Content Model Architecture

Introduction

A major goal of the Fedora architecture has been to provide a simple, flexible and evolvable approach to deliver the "essential characteristics" for enduring digital content. Whenever we work with digital content, it is with an established set of expectations for how an intellectual work may be expressed. With experience we develop "patterns of expression" that are the best compromise we can craft between the capabilities of our digital tools and the intellectual works we create in digital form. We store our digital content with the expectation that all the important characteristics of our intellectual works will be intact each and every time we return to access them, whether it has been a few minutes or many years.

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Deployment of a Service in a repository is accomplished by using the "isDeploymentOf" relation to the SDef object. The Service Deployment (SDep) object is local to a Fedora repository and represents how a Service is implemented by the repository. Finally, the SDep object asserts the "isContractorOf" to indicate the CModel (effectively the class of Data objects) for which it deploys Services. This permits the SDep to access the Datastreams in the Data object and user parameters when an Operation is called for a Data object.

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6: Fedora Repository Server

Thus far, we have talked about the component parts of a Fedora repository, but the larger picture is also important. A repository is made up of digital objects, but in what context do those objects exist and how is it that users interact with them?

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