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Robertson, S. E., Lu, W. and MacFarlane, A. (2006). XML-structured documents: Retrievable units and inheritance. In: Larsen, H. L., Pasi, G., Ortiz-Arroyo, D., Andreasen, T. and Christiansen, H. (Eds.), Flexible Query Answering Systems. Lecture Notes in Computer Science, 4027. (pp. 121-132). Berlin: Springer-Verlag.