Local XML functional dependencies

Authors:
Jixue Liu;Millist Vincent;Chengfei Liu
Affiliations:
The University of South Australia, Mawson Lakes, Australia;The University of South Australia, Mawson Lakes, Australia;The University of South Australia, Mawson Lakes, Australia
Venue:
WIDM '03 Proceedings of the 5th ACM international workshop on Web information and data management
Year:
2003

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Abstract

Keys and functional dependencies play a fundamental role in relational databases where they are used in integrity enforcement and in database design. Similarly, these constraints will play a fundamental role in XML and recently keys and functional dependencies in XML have been defined. In this paper we extend the previous definition of functional dependencies in XML to local functional dependencies in XML. Local functional dependencies (LFDs) are functional dependencies which hold only in a certain part of an XML document and not in the whole document. We also define, and prove correct, axioms for reasoning about the implication of LFDs in XML. Finally, we examine the relationship between LFDs and keys and show that the recently introduced concept of a relative key is a special case of a LFD.