We describe the underlying data model and implementation of a new architecture for the National Science Digital Library (NSDL) by the Core Integration Team (CI). The architecture is based on the notion of an information network overlay. This network, implemented as a graph of digital objects in a Fedora repository, allows the representation of multiple information entities and their relationships. The architecture provides the framework for contextualization and reuse of resources, which we argue is essential for the utility of the NSDL as a tool for teaching and learning.
Abstract. The NSDL (National Science Digital Library) is funded by the National Science Foundation to advance science and math education. The initial product was a metadata-based digital library providing search and access to distributed resources. Our recent work recognizes the importance of context -relations, metadata, annotations -for the pedagogical value of a digital library. This new architecture uses Fedora, a tool for representing complex content, data, metadata, web-based services, and semantic relationships, as the basis of an information network overlay (INO). The INO provides an extensible knowledge base for an expanding suite of digital library services.
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