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cs.DB2003
A Formal Comparison of Visual Web Wrapper Generators
Georg Gottlob, Christoph Koch
We study the core fragment of the Elog wrapping language used in the Lixto system (a visual wrapper generator) and formally compare Elog to other wrapping languages proposed in the…
cs.DB2002
Monadic Datalog and the Expressive Power of Languages for Web Information Extraction
Georg Gottlob, Christoph Koch
Research on information extraction from Web pages (wrapping) has seen much activity recently (particularly systems implementations), but little work has been done on formally study…
cs.DB1998
Hypertree Decompositions and Tractable Queries
G. Gottlob, N. Leone, F. Scarcello
Several important decision problems on conjunctive queries (CQs) are NP-complete in general but become tractable, and actually highly parallelizable, if restricted to acyclic or ne…