1. Abiteboul, S., Bourhis, P., Vianu, V.: Highly expressive query languages for unordered data trees. Theory Comput. Syst. 57(4), 927–966 (2015)
2. Benedikt, M., Fan, W., Geerts, F.: Xpath satisfiability in the presence of DTDs. J. ACM 55(2), 8:1–8:79 (2008)
3. Bex, G.J., Neven, F., Vansummeren, S.: Inferring XML schema definitions from XML Data. In: Proceedings of the 33rd International Conference on VLDB, pp. 998–1009 (2007)
4. Boneva, I., Ciucanu, R., Staworko, S.: Simple schemas for unordered XML. In: Proceedings of the 16th International Conference on WebDB, pp. 13–18 (2013)
5. Che, D., Aberer, K., Özsu, M.T.: Query optimization in XML structured-document databases. J. VLDB 15(3), 263–289 (2006)