S. Abiteboul, P. Buneman, and D. Suciu, Data on the Web: From Relations to Semistructured Data and XML, 1999.

P. Barceló, L. Libkin, A. Poggi, and C. Sirangelo, XML with incomplete information, J. ACM, vol.58, issue.1, p.4, 2010.

M. Benedikt, W. Fan, and F. Geerts, XPath satisfiability in the presence of DTDs, J. ACM, vol.55, issue.2, 2008.

D. Calvanese, G. D. Giacomo, and M. Lenzerini, Semi-structured data with constraints and incomplete information, Description Logics, 1998.

C. David, Complexity of Data Tree Patterns over XML Documents, MFCS, pp.278-289, 2008.
DOI : 10.1007/978-3-540-85238-4_22

R. Fagin, P. G. Kolaitis, R. J. Miller, and L. Popa, Data exchange: semantics and query answering, Theoretical Computer Science, vol.336, issue.1, pp.89-124, 2005.
DOI : 10.1016/j.tcs.2004.10.033

URL : http://doi.org/10.1016/j.tcs.2004.10.033

. Grahne, The Problem of Incomplete Information in Relational Databases, Lecture Notes in Computer Science, vol.554, 1991.
DOI : 10.1007/3-540-54919-6

T. Imielinski and W. Lipski-jr, Incomplete Information in Relational Databases, Journal of the ACM, vol.31, issue.4, pp.761-791, 1984.
DOI : 10.1145/1634.1886

Y. Kanza, W. Nutt, and Y. Sagiv, Querying Incomplete Information in Semistructured Data, Journal of Computer and System Sciences, vol.64, issue.3, pp.655-693, 2002.
DOI : 10.1006/jcss.2001.1811

E. Kopczynski, Trees in trees: Is the incomplete information about a tree consistent? In CSL, pp.367-380, 2011.

M. Lenzerini, Data integration, Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems , PODS '02, pp.233-246, 2002.
DOI : 10.1145/543613.543644

M. Marx, XPath with Conditional Axis Relations, EDBT, pp.477-494, 2004.
DOI : 10.1007/978-3-540-24741-8_28

G. Miklau and D. Suciu, Containment and equivalence for a fragment of XPath, Journal of the ACM, vol.51, issue.1, pp.2-45, 2004.
DOI : 10.1145/962446.962448

F. Neven and T. Schwentick, On the complexity of XPath containment in the presence of disjunction, DTDs, and variables, Logical Methods in Computer Science, vol.2, issue.3, 2006.
DOI : 10.2168/LMCS-2(3:1)2006

T. Peter and . Wood, Containment for XPath fragments under DTD constraints, ICDT, pp.297-311, 2003.