In this article, we describe a number of indexing experiments based on indexing terms other than simple keywords. These experiments were conducted as one step in validating a linguistically-motivated indexing model. The problem is important but not new. What is new in this approach is the variety of schemes evaluated. It is important since it should not only help to overcome the well-known problems of bag-of-words representations, but also the difficulties raised by non-linguistic text simplification techniques such as stemming, stop-word deletion, and term selection. Our approach in the selection of terms is based on part-of-speech tagging and shallow parsing. The indexing schemes evaluated vary from simple keywords to nouns, verbs, adverbs, adjectives, adjacent word-pairs, and head-modifier pairs. Our findings apply to Information Retrieval and most of related areas.

This document describes the Profile project, a multi-disciplinary project aiming at the development of a proactive information lter for dynamic information environments. The goal of this paper is threefold. First, it evaluates the suitability of an agent-based architecture for the Profile project. Second, this article provides an overview of the research done in the Profile project. Third, it describes the integration of this research, which has led to the implementation of a prototype. The architecture and workings of the prototype are illustrated. 1 Introduction The Profile project, started in 1996, aimed to decrease the problems caused by information overload. Its main goal was to develop an eective agent as intermediary between information sources and information users in the context of the World Wide Web. The eectiveness of the Profile system was to be enlarged by going beyond keyword-based approaches. The term Information Discovery ([35]) was introduced to describe the synth...

NOTICE: this is the author’s version of a work that was accepted for publication in Information Processing and Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Information