Guest Editorial: Special Issue on Database Theory
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This volume contains invited papers from the 20th edition of the International Conference on Database Theory, which was held in Venice, Italy in 2017. Originally biennial, the ICDT conference has been held annually and jointly with the conference on Extending Database Technology (EDBT) since 2009.
Better Streaming algorithms for the Maximum Coverage problem, by Andrew McGregor and Hoa T. Vu, in the area of stream-processing;
Evaluating Datalog via Tree Automata and Cycluits, by Antoine Amarilli, Pierre Bourhis, Mikaël Monet and Pierre Senellart, in the area of query evaluation;
A logic for Document Spanners, by Dominik D. Freydenberger, in the area of information extraction.
We want to acknowledge the work of the program committee and the journal reviewers, along with the TOCS staff and TOCS former Editor-in-Chief, Alan Selman, in making this edition possible.