Monadic Datalog and the Expressive Power of Languages for Web Information Extraction
Summary: Monadic datalog over ranked/unranked trees is equivalent to full MSO for web wrapping, proposing MSO as the expressiveness yardstick. Elog- (Lixto kernel) exactly captures MSO while remaining visually specifiable; formal comparisons to other wrappers. (summarized by gpt-5-mini on Feb 09 2026)
Incoming Non-self Citations Over Time
Authors
- 1. Georg Gottlob (Vienna University of Technology)
- 2. Christoph Koch (Vienna University of Technology)
BibTeX Citation
@inproceedings{gottlob_pods02,
address = {New York, NY, USA},
series = {{PODS} '02},
title = {{Monadic Datalog and the Expressive Power of Languages for Web Information Extraction}},
url = {https://dl.acm.org/doi/10.1145/543613.543617},
doi = {10.1145/543613.543617},
booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
publisher = {Association for Computing Machinery},
author = {Gottlob, Georg and Koch, Christoph},
year = {2002}
}
Incoming Citations (Sorted by Pagerank)
Showing 15 of 15 citing papers.
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Outgoing Citations (Sorted by Pagerank)
Showing 4 of 4 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 348 | Regular Path Queries with Constraints | 1997 | PODS | 0.00020518814 |
| 2,564 | Visual Web Information Extraction with Lixto | 2001 | VLDB | 8.4118854e-05 |
| 2,708 | Cut and Paste | 1997 | PODS | 8.2272626e-05 |
| 2,969 | Expressive and efficient pattern languages for tree-structured data (extended abstract) | 2000 | PODS | 7.9147299e-05 |
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