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Prototype Repository (developed by CNRI)

• A description of the architecture of the prototype repository developed by CNRI for the NDLP is provided by An Architecture for Information in Digital Libraries, an article by William Y. Arms, Christophe Blanchi, and Edward A. Overly of CNRI in the February 1997 issue of Dlib magazine.
  [ at http://www.dlib.org/dlib/february97/cnri/02arms1.html ]
• Structural Metadata for LC digitized materials describes the current elements of structural and administrative metadata expected to be integrated into a repository for LC digitzed materials. Not all these elements are represented in the CNRI prototype repository.
• The prototype repository uses handles instead of internal identifiers and invokes a Handle Server for retrieving component objects.
• The prototype repository incorporates mechanisms for managing access to individual digital objects. The model used is described in Implementing Policies for Access Management, an article by William Y. Arms of CNRI in the February 1998 issue of Dlib magazine.
  [ at http://www.dlib.org/dlib/february98/arms/02arms.html ]

Related reading from outside the Library of Congress:

Key Concepts in the Architecture of the Digital Library, William Y. Arms, D-Lib Magazine, July 1995. (hdl:cnri.dlib/july95-arms.html).
[At http://www.dlib.org/dlib/July95/07arms.html].

In this article, based on a presentation at the April 1995 meeting of the Coalition of Networked Information (CNI), Bill Arms of CNRI introduces the handle-server and repository in simple terms and diagrams.

A Framework for Distributed Digital Object Services. Robert Kahn & Robert Wilensky, May 13, 1955. (hdl:cnri.dlib/tn95-01).
[At http://WWW.CNRI.Reston.VA.US/home/cstr/arch/k-w.html]

This paper provides a much more formal description of the concepts behind the repository architecture and the Repository Access Protocol (RAP).

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Repository (under development with CNRI)

National Digital Library Program
Comments: caar@loc.gov (12/31/98)