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A Survey on Information Systems Interoperability
, 2003
"... The interoperability of information systems has been pursued for a long time and is even more demanded in the Internet era. This paper reviews the literature in this area, from the database perspective. It covers work on interconnection of databases, classification of data integration problems, ma ..."
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The interoperability of information systems has been pursued for a long time and is even more demanded in the Internet era. This paper reviews the literature in this area, from the database perspective. It covers work on interconnection of databases, classification of data integration problems, major standards and architectures, and the most recent developments in the fields of semantic Web, Web services and scientific workflows.
Visual Interfaces for the Development of Event-based Web Agents in the IRobot System
"... Abstract. Timely integration and analysis of information from the World-Wide Web is important for businesses and startups, especially to cope with the increasing global competition need. Manual Web data analysis is time consuming and error prone, while developing automated algorithms is nontrivial e ..."
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Abstract. Timely integration and analysis of information from the World-Wide Web is important for businesses and startups, especially to cope with the increasing global competition need. Manual Web data analysis is time consuming and error prone, while developing automated algorithms is nontrivial even for expert Web programmers. We argue that an event-based architecture that couples Web-agent technology with visual-programming methodology is ideal for Web-data analysis. We demonstrate this with the IRobot system, which uses visual interfaces to facilitate the design of eventbased intelligent Web agents for data integration. The system is effective in both its ability to capture human-oriented Web procedures and its flexibility in modeling complex agents that meet human goals. Keywor ds: Web computing, rule-based systems, Web agents, data integration, Web automation
editors: prof.dr. P.M.E. De Bra prof.dr.ir. J.J. van Wijk
, 2004
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Providing Robust Access to Data in Web Pages
, 2004
"... Much useful e-commerce information is available on web pages, especially those created by queries to web servers. The problem for programs to use that information is how to `screen-scrape' the data off the web page into machine usable data structures. Wrappers for web data sources use knowledge ..."
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Much useful e-commerce information is available on web pages, especially those created by queries to web servers. The problem for programs to use that information is how to `screen-scrape' the data off the web page into machine usable data structures. Wrappers for web data sources use knowledge of the page layout in order to extract data accurately. So they fail if page format changes. This paper describes a fast method for wrapper production and also a method to automatically detect page format change, before it causes data access to fail. The method works for pages that contain collections of items, such as lists, tables and hierarchical structures. It uses a representation of html documents, which makes repetitive features apparent. This provides fully automatic wrapper production for a class of web pages, and rapid interactive production for others.
Wrapping of Web Sources with restricted Query Interfaces by Query Tunneling
"... Information sources in the World Wide Web usually offer two different schemes to their users, an Interface Schema which the user can query and a Result Schema which the user can browse. Often the Interface schema is more restricted than the result schema, moreover many sources offer keyword-search i ..."
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Information sources in the World Wide Web usually offer two different schemes to their users, an Interface Schema which the user can query and a Result Schema which the user can browse. Often the Interface schema is more restricted than the result schema, moreover many sources offer keyword-search interfaces only. Thus query capabilities of such sources are very small and a useful integration into a mediator-based information system using query capabilities is almost impossible. We propose the Query Tunnelling Architecture for the Wrapping of these restricted web sources. Wrapping of sources by Query Tunneling hides restrictive query in-terfaces and makes such sources fully queryable based on their result schema. The process of Query Tunneling is divided into two main steps, Query Relaxation to make a higher order query suitable to a restricted interface and Result Restriction in order to filter the results using the original query.
