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Keys in XML: Capturing Identification and Uniqueness

Authors: M. Karlinger, M. Vincent, M. Schrefl
Paper: Karl09b (2009)
Citation: G. Vossen, D. D. E. Long, J. X. Yu (Eds.): Proceedings of the 10th International Conference on Web Information Systems Engineering (WISE 2009), October 5-7, 2009, Poznan, Poland, Springer Verlag, Lecture Notes in Computer Science, LNCS Vol. 5802, pp. 563-571, 2009.
Resources: Copy  (In order to obtain the copy please send an email with subject  Karl09b  to


In this article a new type of key constraint in XML, called anXKey, is proposed. The motivation for an XKey is based on the observation that existing approaches do not always capture the fundamental properties of a key, namely identification and uniqueness, and it is shown that an XKey always has these properties. It is also shown that an XKey has the desirable property of extending the notion of a relational key.

Keywords: XML, Integrity Constraints, Keys.