... disjunction,DTDs, and variables. In International Conference on Database Theory, 2003.12. A. Schmidt, F. Waas, M. Kersten, D. Florescu, M. Carey, I. Manolescu, and R. Busse. Why and how to benchmark XML databases. ... Workshop on Efficiency and Effectiveness of XML Tools and Techniques (EEXTT), pages 148–158. Springer Verlag, 2002.5. S. Ceri, S. Comai, E. Damiani, P. Fraternali, and S. Paraboschi. XML- gl: a gra-phical ... each element of XML documents with its start and end positions, where the start and end positions are, respectively, the positionsof the start and the end tags of elements in XML documents. This...