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We focus on the problem of semi-automated query discovery for XML views without requiring the intervention of an expert to guarantee a correct final result. Given multiple independent sources of heterogeneous XML data structures, our tool, SPHINX, lets a nontechnical user define views using example -based, graphical, interaction. SPHINX embodies a syntactically derived meta-model of federating view definitions. The meta-model of federating view definitions enables, first, an active-learningdoi:10.1007/s10844-006-0011-2 fatcat:f3x4g66bxvbvvlb72asg3rygqu