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The Computer Journal 2004 47(5):591-601; doi:10.1093/comjnl/47.5.591
© 2004 by British Computer Society
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Legality of XML-Schema Type Hierarchies

Anna Formica

LEKS, IASI–CNR, Viale Manzoni 30, I-00185, Rome, Italy

The eXtensible Markup Language (XML) and XML-Schema are increasingly becoming the languages of choice to exchange data and describe data across the Internet, respectively. In this perspective, much of the database research focus is shifting from the traditional database models to the semistructured data and XML. In this paper, a formal framework supporting the design of XML-Schema type hierarchies has been proposed, by following and revisiting the database approach. In particular, the notion of a legal XML-Schema type hierarchy has been formally given and an algorithm for checking the legality of type hierarchies has been proposed.

Received 11 September 2003. Revised 12 March 2004.

* Email: formica{at}iasi.rm.cnr.it


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