An overview of the object protocol model (OPM) and the OPM data management tools
Information Systems - Special issue: databases: their creation, management and utilization
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
The object database standard: ODMG 2.0
The object database standard: ODMG 2.0
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Exploring Heterogeneous Biological Databases: Tools and Applications
EDBT '98 Proceedings of the 6th International Conference on Extending Database Technology: Advances in Database Technology
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Constructing and Maintaining Scientific Database Views in the Framework of the Object-Protocol Model
SSDBM '97 Proceedings of the Ninth International Conference on Scientific and Statistical Database Management
A New Query Processing Scheme in a Web Data Engine
DNIS '02 Proceedings of the Second International Workshop on Databases in Networked Information Systems
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Web datasources usually allow a restricted access (through CGI calls) and their output consists of generated HTML documents. Unfortunately, in many cases the data they provide happen to be available only on the Web. In this paper, we describe a system based on a Web wrapper combined with an object multidatabase system that enables the user to query Web datasources as well as other datasources with an OQL-like query language. The approach is based on two successive views of the Web datasource: a search view characterizing its access and an object view extending the restricted search view with respect the extraction capabilities of the wrapper. Both views are non-materialized to provide the user with up-to-date data. Our approach has been developed and demonstrated as part of the multidatabase system supporting queries via uniform Object Protocol Model (OPM) interfaces.