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http://hdl.handle.net/1942/15816
Title: | Simplifying XML Schema: Single-type approximations of regular tree languages | Authors: | GELADE, Wouter Idziaszek, Tomasz MARTENS, Wim NEVEN, Frank Paredaens, Jan |
Issue Date: | 2013 | Source: | JOURNAL OF COMPUTER AND SYSTEM SCIENCES, 79 (6), p. 910-936 | Abstract: | XML Schema Definitions (XSDs) can be adequately abstracted by the single-type regular tree languages. It is well known that these form a strict subclass of the robust class of regular unranked tree languages. Sadly, in this respect, XSDs are not closed under the basic operations of union and set difference, complicating important tasks in schema integration and evolution. The purpose of this paper is to investigate how the union and difference of two XSDs can be approximated within the framework of single-type regular tree languages. We consider both optimal lower and upper approximations. We also address the more general question of how to approximate an arbitrary regular tree language by an XSD and consider the complexity of associated decision problems. | Notes: | Martens, W (reprint author), Univ Bayreuth, Bayreuth, Germany. Email: wouter.gelade@uhasselt.be; idziaszek@mimuw.edu.pl; wim.martens@uni-bayreuth.de; frank.neven@uhasselt.be; jan.paredaens@ua.ac.be | Keywords: | XML; XML Schema; Approximation; Complexity | Document URI: | http://hdl.handle.net/1942/15816 | ISSN: | 0022-0000 | e-ISSN: | 1090-2724 | DOI: | 10.1016/j.jcss.2013.01.009 | ISI #: | 000319368900009 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2014 |
Appears in Collections: | Research publications |
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p251-gelade.pdf | Peer-reviewed author version | 457.72 kB | Adobe PDF | View/Open |
gelade.pdf Restricted Access | Published version | 499.54 kB | Adobe PDF | View/Open Request a copy |
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