aDORe: A Modular, Standards-Based
			   Digital Object Repository

	     Herbert Van de Sompel, Los Alamos National Laboratory

Abstract:
This seminar focuses on the use of the OAI-PMH, NISO OpenURL and MPEG-21 DIP to
store assets in a repository architecture designed for the Research Library of
the Los Alamos National Laboratory, and to make the stored assets available in
a uniform way to various downstream applications. In the architecture, the
MPEG-21 Digital Item Declaration Language (MPEG-21 DIDL) is used as the
XML-based format to represent assets as Digital Objects. A Digital Object
represented according to the MPEG-21 DIDL syntax is referred to as a DIDL
document. Through an ingestion process, these DIDL documents are stored in a
multitude of autonomous OAI-PMH repositories. An OAI-PMH compliant Repository
Index keeps track of the creation and location of all those repositories,
whereas an Identifier Locator keeps track of the location of an individual
Digital Object. An OAI-PMH Federator is introduced as a single-point-of-access
to downstream harvesters. It hides the complexity of the environment to those
harvesters, and allows them to obtain transformations of stored DIDL documents
by using an MPEG-21 DIP Engine. An OpenURL Resolver facilitates the delivery of
various disseminations of the stored Digital Objects and their constituent
datastreams. While these aspects of the architecture are described in the
context of the LANL library, the paper will also briefly touch on their more
general applicability.

Bio:
Herbert Van de Sompel graduated in Mathematics and Computer Science at Ghent
University, and in 2000, obtained a Ph.D. there. For many years, he was Head of
Library Automation at Ghent University. After having left Ghent in 2000, he has
been Visiting Professor in Computer Science at Cornell University, and Director
of e-Strategy and Programmes at the British Library. Currently, he is the team
leader of the Digital Library Research and Prototyping Team at the Research
Library of the Los Alamos National Laboratory. Herbert has played a major role
in creating the Open Archives Protocol for Metadata Harvesting, the OpenURL
Framework for Context-Sensitive Services, and the SFX linking server.