Abstract

this article cross-cut a number of the usual layers of digital library architectures including retrieval engines, access protocols, intermediate services, and user inter38 Rose Kearns Xerox Allaire Hicks Love Magnin Reid Kobayashi Adams Chamber Howard 3 Vairo Montgomery Merritt Stevens Hajia Rosner Galvin Biele Lovell Bardsley Rosner Senter Sachdav Rosen Carey Male McOi Filt Molin Cut Bun Car Puc Yea Keys Four Ran Mag Pit Nus Sai Rei Bar Ros Ken Mer Ish Kob Spencer D.T. Kearns, CEO, Chairman, Chief Executive Officer 667 ---- 135 Figure 12. The Hyperbolic Tree Browser faces. Retrieval engines need to support a much broader range of operations that allow the user to understand properties of entire collections, groups of documents, or documents themselves, thus more effectively supporting query refinement as well as other stages of the task. Access protocols and intermediate servers should provide various forms of bridge or meta-services that explicitly reveal the characteristics of the information and the mediating access mechanisms, thus allowing effective and memorable rendering of sources and their contents. Finally, the user interface should be thought of as a complete workspace in which a variety of tools are available for flexibly interacting with richly-conveyed information

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