Niehren, Joachim ;
Planque, Laurent ;
Talbot, Jean-Marc ;
Tison, Sophie
N-ary Queries by Tree Automata
Abstract
Information extraction from semi-structured documents requires to find
n-ary queries in trees that define appropriate sets of n-tuples of
nodes. We propose new representation formalisms for
n-ary queries by tree automata that we prove to capture MSO. We then
investigate n-ary queries by unambiguous tree automata which are
relevant for query induction in multi-slot information extraction.
We show that this representation formalism captures the
class of n-ary queries that are finite unions of Cartesian closed
queries, a property we prove decidable.
BibTeX - Entry
@InProceedings{niehren_et_al:DSP:2005:226,
author = {Joachim Niehren and Laurent Planque and Jean-Marc Talbot and Sophie Tison},
title = {N-ary Queries by Tree Automata},
booktitle = {Foundations of Semistructured Data},
year = {2005},
editor = {Frank Neven and Thomas Schwentick and Dan Suciu},
number = {05061},
series = {Dagstuhl Seminar Proceedings},
ISSN = {1862-4405},
publisher = {Internationales Begegnungs- und Forschungszentrum f{\"u}r Informatik (IBFI), Schloss Dagstuhl, Germany},
address = {Dagstuhl, Germany},
URL = {http://drops.dagstuhl.de/opus/volltexte/2005/226},
annote = {Keywords: Information extraction, semistructured documents, node selecting queries in trees}
}
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Keywords: |
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Information extraction, semistructured documents, node selecting queries in trees |
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Seminar: |
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05061 - Foundations of Semistructured Data
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2005 |
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Date of publication: |
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2005 |
2005
