Reasoning about Keys for XML
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We study absolute and relative keys for XML, and investigate their associated decision problems. We argue that these keys are important to many forms of hierarchically structured data including XML documents. In contrast to other proposals of keys for XML, these keys can be reasoned about efficiently. We show that the (finite) satisfiability problem for these keys is trivial, and their (finite) implication problem is finitely axiomatizable and decidable in PTIME in the size of keys.
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Postprint version. Published in Lecture Notes in Computer Science, Volume 2397, Revised Papers of the 8th International Workshop on Database Programming Languages 2001 (DBPL 2001), pages 133-148. Publisher URL: http://www.springerlink.com/link.asp?id=74fqf7v3ky2d0w3y
Postprint version. Published in Lecture Notes in Computer Science, Volume 2397, Revised Papers of the 8th International Workshop on Database Programming Languages 2001 (DBPL 2001), pages 133-148. Publisher URL: http://www.springerlink.com/link.asp?id=74fqf7v3ky2d0w3y