Week 2 Reading Notes

Just a few notes on the articles I read for this week...

A Framework for Building Open Digital Libraries


The technology behind Digital Libraries is evolving at a faster pace than the already well-established practices of library science, so standards such as the Dublin Core Metadata Element Set and the Open Archives Initiative's Protocol for Metadata Harvesting (OAI-PMH) aim to make library and computer/data systems more interoperable.

Digital libraries are often custom-built, and therefore not designed to be interoperable with/within other systems. Program logic (which can be complex) varies according to community needs. As of the article date (Dec. 2001), few software tool kits existed for the express purpose of building digital libraries; in the absence of such unified starting-points, the OAI Protocol for Metadata Harvesting treats multiple DLs as searchable Open Archives. The Open Digital Library design allows for interoperability at the functional level across physically separate collections. Various components of an ODL network allow users to browse by categories, combine metadata from multiple sources, search and filter search results, sort by date, and so on. Ultimately, the authors hope to influence the development of DLs starting from the design stage.

Interoperability for Digital Objects and Repositories


This article describes the Cornell/Corporation for National Research Initiatives' own efforts to develop and employ a design for interoperable digital repositories. The authors' own approach is a hybrid of some of the traditional approaches to achieving interoperability, such as standardization (e.g., schema definition, data models, protocols), distributed object request architectures (e.g., CORBA), remote procedure calls, mediation (e.g., gateways, wrappers), and mobile computing (e.g., Java applets).

The article mentions the authors' focus on the preservation of digital items, standardization of format, and attention to access issues. The article lists certain components of accessing digital objects: disseminator types (usually outside operations), servlets (executable programs), and the notion of extensibility (how easily the new digital object can be used with additional functionality).

The authors performed experiments to test extensibility, interoperability, functionality, and other access/compatibility issues. The tests were mostly successful, and will guide the authors' future research on the implementation of programs designed to increase interoperability.

An Architecture for Information in Digital Libraries


This article gives an overview of the structure of stored information in digital libraries. I aim to fill in details as soon as I get the chance!