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Validation of expressive XML keys with XML schema and XQuery
The eXtensible Markup Language (XML) is the defacto industry standard for exchanging data on the Web and elsewhere. While the relational model of data enjoys a well-accepted definition of a key, several competing notions ...
Soft cardinality constraints on XML data: How exceptions prove the business rule
(Springer Verlag, 2013)
We introduce soft cardinality constraints which need to be satisfied on average only, and thus permit violations in a controlled manner. Starting from a highly expressive but intractable class, we establish a fragment that ...