Logical foundations of object-oriented and frame-based languages
Journal of the ACM (JACM)
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
Wrapper generation for semi-structured Internet sources
ACM SIGMOD Record
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
Database techniques for the World-Wide Web: a survey
ACM SIGMOD Record
Managing semistructured data with florid: a deductive object-oriented perspective
Information Systems - Special issue on semistructured data
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Jedi: Extracting and Synthesizing Information from the Web
COOPIS '98 Proceedings of the 3rd IFCIS International Conference on Cooperative Information Systems
A Conceptual-Modeling Approach to Extracting Data from the Web
ER '98 Proceedings of the 17th International Conference on Conceptual Modeling
Looking at the Web through XML Glasses
COOPIS '99 Proceedings of the Fourth IECIS International Conference on Cooperative Information Systems
Knowledge-Based Integration of Neuroscience Data Sources
SSDBM '00 Proceedings of the 12th International Conference on Scientific and Statistical Database Management
Integrating semi-structured data into business applications: a web intelligence example
WM'05 Proceedings of the Third Biennial conference on Professional Knowledge Management
WDEE: web data extraction by example
DASFAA'05 Proceedings of the 10th international conference on Database Systems for Advanced Applications
Schema driven and topic specific web crawling
DASFAA'05 Proceedings of the 10th international conference on Database Systems for Advanced Applications
Information extraction for the semantic web
Proceedings of the First international conference on Reasoning Web
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The goal of information extraction from the Web is to provide an integrated view on heterogeneous information sources via a common data model and query language. A main problem with current approaches is that they rely on very different formalisms sind tools for wrappers and mediators, thus leading to an "impedance mismatch" between the wrapper and mediator level. In contrast, our approach integrates wrapping and mediation in a unified framework based on an object-oriented data model which represents both the Web structure and the data of the application domain. Wrappers and mediators are written in a rule-based object-oriented language which is augmented with features for Web access and structured document analysis, i.e., pattern matching by regular expressions and SGML parsing. In this paper, we develop generic, reusable rule patterns for typical extraction, integration, and restructuring tasks using this framework. We show the practicability of our approach by using the FLORID system [10].