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In this paper, we present an approach to the incorporation of object versioning into a distributed full-text information retrieval system. We propose an implementation based on "partially versioned' index sets, arguing that its space overhead and querytime performance make it suitable for full-text IR, with its heavy dependence on inverted indexing. We develop algorhhrns for computing both historical queries and time range queries and show how these algorithms can be applied to a number of problems in distributed information management, such as data replication, caching, transactional consistency, and hybrid media repositories.

This paper describes the design of a direct manipulation user interface for Boolean information retrieval. Intended to overcome the difficulties of manipulating explicit Boolean queries as well as the "black box" drawbacks of so-called natural language query systems, the interface presents a two-dimensional graphical representation of a user's natura3 language query which not only exposes heuristic query nansformations performed by the system, but also supports query reformulation by the user via direct manipulation of the representation.-The paper illustrates the operation of the interface as implemented in the AI-STARS full-text information retrieval system.

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