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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/593

Title: XML with data values: typechecking revisited
Authors: Alon, Noga
Milo, Tova
NEVEN, Frank
Issue Date: 2003
Publisher: Elsevier
Citation: Journal of Computer and System Sciences, 66(4). p. 688-727
Abstract: We investigate the typechecking problem for XML queries: statically verifying that every answer to a query conforms to a given output DTD, for inputs satisfying a given input DTD. This problem had been studied by a subset of the authors in a simplified framework that captured the structure of XML documents but ignored data values. We revisit here the typechecking problem in the more realistic case when data values are present in documents and tested by queries. In this extended framework, typechecking quickly becomes undecidable. However, it remains decidable for large classes of queries and DTDs of practical interest. The main contribution of the present paper is to trace a fairly tight boundary of decidability for typechecking with data values. The complexity of typechecking in the decidable cases is also considered.
URI: http://hdl.handle.net/1942/593
DOI: 10.1016/S0022-0000(03)00032-1
ISI #: 000183896800005
ISSN: 0022-0000
Category: A1
Type: Journal Contribution
Validation: ecoom, 2004
Appears in Collections: Databases and Theoretical Computer Science

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