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    On the existence of Armstrong data trees for XML functional dependencies

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    Armstrong databases are a popular tool in example-based database design. An Armstrong database for a given constraint set βˆ‘ from a fixed constraint class satisfies precisely those constraints from that are logically implied by βˆ‘. In this paper we study Armstrong data trees for functional dependencies for XML-encoded data in the context of a simple XML tree model reflecting the permitted parent-child relationships together with their frequencies
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