An overview of transaction logic
Theoretical Computer Science - Special issue on formal methods in databases and software engineering
The Araneus Web-based management system
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
Capabilities-Based Query Rewriting in Mediator Systems
Distributed and Parallel Databases - Special issue on parallel and distributed information systems
Database techniques for the World-Wide Web: a survey
ACM SIGMOD Record
Computing capabilities of mediators
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
A layered architecture for querying dynamic Web content
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
XML-based information mediation with MIX
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Managing semistructured data with florid: a deductive object-oriented perspective
Information Systems - Special issue on semistructured data
A Query Translation Scheme for Rapid Implementation of Wrappers
DOOD '95 Proceedings of the Fourth International Conference on Deductive and Object-Oriented Databases
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Querying Heterogeneous Information Sources Using Source Descriptions
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Capability-Sensitive Query Processing on Internet Sources
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
A mediation infrastructure for digital library services
DL '00 Proceedings of the fifth ACM conference on Digital libraries
Querying Web Information Systems
ER '01 Proceedings of the 20th International Conference on Conceptual Modeling: Conceptual Modeling
View integration and cooperation in databases, data warehouses and web information systems
Journal on Data Semantics IV
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We propose a method for modeling complex Web sources that have active user interaction requirements. Here "active" refers to the fact that certain information in these sources is only reachable through interactions like filling out forms or clicking on image maps. Typically, the former interaction can be automated by wrapper software (e.g., using parameterized urls or post commands) while the latter cannot and thus requires explicit user interaction. We propose a modeling technique for such interactive Web sources and the information they export, based on so-called interaction diagrams. The nodes of an interaction diagram model sources and their exported information, whereas edges model transitions and their interactions. The paths of a diagram correspond to sequences of interactions and allow to derive the various query capabilities of the source. Based on these, one can determine which queries sire supported by a source and derive query plans with minimal user interaction. This technique can be used offline to support design and implementation of wrappers, or at runtime when the mediator generates query plans against such sources.