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Dagstuhl Seminar 08621, Dagstuhl : Allemagne (2008)
Compression vs Queryability - A Case Study
Siva Anantharaman 1
(11/2008)

Some compromise on compression is known to be necessary, if the relative positions of the information stored by semi-structured documents are to remain accessible under queries. With this in view, we compare, on an example, the `query-friendliness' of XML documents, when compressed into straightline tree grammars which are either regular or context-free. The queries considered are in a limited fragment of XPath, corresponding to a type of patterns; each such query defines naturally a non-deterministic, bottom-up `query automaton' that runs just as well on a tree as on its compressed dag.
1 :  Laboratoire d'Informatique Fondamentale d'Orléans (LIFO)
Université d'Orléans : EA4022 – Ecole Nationale Supérieure d'Ingénieurs de Bourges
Informatique/Logique en informatique
Tree automata – Tree Grammars – Dags – XML documents – Queries.
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