NDLI: Solutions in XML data exchange

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Solutions in XML data exchange

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Solutions in XML data exchange

Content Provider	ACM Digital Library
Author	Kołodziejczyk, Leszek A. Murlak, Filip Bojańczyk, Mikołaj
Abstract	The task of XML data exchange is to restructure a document conforming to a source schema under a target schema according to certain mapping rules. The rules are typically expressed as source-to-target dependencies using various kinds of patterns, involving horizontal and vertical navigation, as well as data comparisons. The target schema imposes complex conditions on the structure of solutions, possibly inconsistent with the mapping rules. In consequence, for some source documents there may be no solutions. We investigate three problems: deciding if all documents of the source schema can be mapped to a document of the target schema (absolute consistency), deciding if a given document of the source schema can be mapped (solution existence), and constructing a solution for a given source document (solution building). We show that the complexity of absolute consistency is rather high in general, but within the polynomial hierarchy for bounded depth schemas. The combined complexity of solution existence and solution building behaves similarly, but the data complexity turns out to be very low. In addition to this we show that even for much more expressive mapping rules, based on MSO definable queries, absolute consistency is decidable and data complexity of solution existence is polynomial.
Starting Page	102
Ending Page	113
Page Count	12
File Format	PDF
ISBN	9781450305297
DOI	10.1145/1938551.1938567
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-03-21
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Solution building Absolute consistency Xml data exchange Regular queries Patterns Solution existence
Content Type	Text
Resource Type	Article

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