This paper discusses the special characteristics and needs of software repositories and describes how these needs have been met by some existing repositories. These repositories include Netlib, the National HPCC Software Exchange, and the GAMS Virtual Repository. We also describe some systems that provide on-line access to various types of scientific data. Finally, we outline a proposal for integrating software and data repositories into the world of digital document libraries, in particular CNRI's ARPA-sponsored Digital Library project. The work described in this paper was sponsored by NASA under Grant No. NAG 52736, by the National Science Foundation under Grant No. ASC-9103853, and by AT&T Bell Laboratories. y Author to whom correspondence should be directed. 107 Ayres Hall, Computer Science Department, University of Tennessee, Knoxville, TN 37996-1301, (615) 974-5886, browne@cs.utk.edu 1 Introduction Most work on digital libraries has focused on storage, retrieval, and disp...

A location-independent naming system for network resources has been designed to facilitate organization and description of software components accessible through a virtual distributed repository. This naming system enables easy and efficient searching and retrieval, and it addresses many of the consistency, authenticity, and integrity issues involved with distributed software repositories by providing mechanisms for grouping resources and for authenticity and integrity checking. This paper details the design of the naming system, describes a prototype implementation of some of the capabilities, and describes how the system fits into the development of the National HPCC Software Exchange, a virtual software repository that has the goal of providing access to reusable software components for high-performance computing.

this paper. The following sections describe the implementation of the indexing and retrieval modules, and the retrieval experiments that were performed. Following a discussion of the results obtained from this system is a description of the implementation issues specific to the POSTGRES database system. In this paper, the words keyword, term, and token are often used interchangeably, as are the words record and tuple. 2 Related Work

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A major e#ort in the Sequoia 2000 project was to build a very large database of Earth Science information. However, without the means to e#ciently and e#ectively locate required information and to browse its contents, this vast database would rapidly become unmanagable and eventually unusable. The "Electronic Repository" project of Sequoia 2000 was intended to address these problems by the development of indexing and retrieval software incorporated into the POSTGRES database management system. This article will describe the elements of the Electronic Repository project for Sequoia 2000, including the design of probabilistic indexing and retrieval for text documents in POSTGRES, and the development of algorithms for automatic geo-referencing of text documents and segmentation of full texts into topically coherent segments for improved retrieval. Graphical interfaces to support these retrieval features will also be described. 1 Introduction Global change researchers, studying...