CNRI's program of research and development in digital libraries has a number of inter-related activities that overlap and build upon each other. The work includes development of core technology that is used in several testbeds and implementation projects, with funding from a variety of sources.
The Digital Object Architecture Project continues the architectural work of the DARPA-funded Computer Science Technical Reports Project (CSTR).The project focuses on the development of an infrastructure of services that provide access to distributed and secure digital objects. Digital objects are networked objects that are instantiated by an infrastructure service we call a repository. Digital objects provide access to their content using an extensible and secure dissemination mechanism. Disseminations can be thought of as high level types that are uniquely distinguished by a combination of operations, and types of data the latter are performed on. Disseminations consist of mobile code called Servlet that can be designed, implemented, and registered with the digital object infrastructure by anyone with the proper permissions. Any digital object with the appropriate rights can automatically use registered servlets. This extensible dissemination mechanism enables digital objects to accommodate a wide variety of possible content, from complex to simple, static or dynamic, and from permanent to real time data. Disseminations have few operational limits and enable digital objects to dynamically generate or acquire their content.
Current ongoing research includes the development of dissemination registry, infrastructure searching, security and scalability.
Support for the Digital Object Architecture project is provided by DARPA, the Library of Congress, and the Defense Technical Information Center (DTIC), through DARPA grant MDA972-92-J-1029.
Applications, Testbeds, and Partners
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Updated: 21 Sep 01