Jean-Robert Gruser

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There is an increase in the number of data sources that can be queried across the WWW. Such sources typically support HTML forms-based interfaces and search engines query collections of suitably indexed data. The data is displayed via a browser. One drawback to these sources is that there is no standard programming interface suitable for applications to(More)
Abstract. The rapid growth of the Internet and support for interoperability protocols has increased the number of Web accessible sources, WebSources. Current wrapper mediator architectures need to be extended with a wrapper cost model (WCM) for WebSources that can estimate the response time (delays) to access sources as well as other relevant statistics.(More)
There is an increase in the number of data sources that can be queried across the WWW. Such sources typically support HTML forms-based interfaces and search engines query collections of suitably indexed data. The data is displayed via a browser. One drawback to these sources is that there is no standard programming interface suitable for applications to(More)
An object query can include a path expression to traverse a number of related collections. The order of collection traversals given by the path expression may not be the most efficient to process the query. This generates a critical problem for an object query optimizer to select the best execution plan. This paper studies the different algorithms to(More)
Current mediator and wrapper architectures do not have the flexibility to scale to multiple wrapped sources, where some sources may be redundant, and some sources may provide incomplete answers to a query. We propose a metawrapper component which is capable of handling multiple wrapped sources, in a particular domain, where the multiple sources provide(More)
We support exible query processing with autonomous networked information sources. Flexibility allows a query to be accepted in a dynamic environment with unavailable sources. Flexibility provides the ability to identify equivalent sources, based on their contents; these equivalences are used to eliminate redundancy and provide alternate query plans, when(More)
We support exible query processing with autonomous networked information sources. Flexibility allows a query to be accepted in a dynamic environment with unavailable sources. Flexibility provides the ability to identify equivalent sources, based on their contents; these equivalences are used to eliminate redundancy and provide alternate query plans, when(More)