SIGMOD '91 Proceedings of the 1991 ACM SIGMOD international conference on Management of data
The Unified Modeling Language reference manual
The Unified Modeling Language reference manual
Designing OQL: allowing objects to be queried
Information Systems
PODS '99 Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Web Modeling Language (WebML): a modeling language for designing Web sites
Proceedings of the 9th international World Wide Web conference on Computer networks : the international journal of computer and telecommunications netowrking
Contexts and Views in Object-Oriented Languages
CONTEXT '99 Proceedings of the Second International and Interdisciplinary Conference on Modeling and Using Context
A New Approach in Object-Based Knowledge Representation: The AROM System
Proceedings of the 14th International conference on Industrial and engineering applications of artificial intelligence and expert systems: engineering of intelligent systems
Contextualization as an Abstraction Mechanism for Conceptual Modelling
ER '99 Proceedings of the 18th International Conference on Conceptual Modeling
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Web-based Information Systems (WIS) are used for diffusing and processing information over the Internet. Because of the large amounts of information they manage, it is crucial to adapt the delivered information. This can be done by giving users a progressive access to information. For this purpose, we propose to stratify the Information Space of a WIS by decomposing it into personalized sub-Information This stratification is described through a Progressive Access Model (PAM) written in UML. The PAM gives WIS users, first, access to some information considered as minimal and essential, and then, allows them to navigate through larger and/or smaller personalized Information Spaces. Together with the PAM, we present a specific query language which allows to query a stratified Information Space. This way, the stratification is taken into account in query expressions, while replies are formatted according to the different levels of detail available in the stratified user's Information Space.