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We first provide an example to show that two previously published results in [2] and [4] on tree pattern containment under schema graphs are incorrect. We then show that the original result in [2] holds under some special conditions on the schema graph.
We show that several classes of tree patterns observe the independence of containing patterns property, that is, if a pattern is contained in the union of several patterns, then it is contained in one of them. We apply this property to two related problems on tree pattern rewriting using views. First, given view V and query Q, is it possible for Q to have an equivalent rewriting using V which is the...
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