Incomplete Information in Relational Databases
Journal of the ACM (JACM)
Capability based mediation in TSIMMIS
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
Proceedings of the 10th international conference on World Wide Web
Representing and querying XML with incomplete information
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
On XML integrity constraints in the presence of DTDs
Journal of the ACM (JACM)
Information Integration Using Logical Views
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Object Fusion in Mediator Systems
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
Capturing both types and constraints in data integration
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
XML data exchange: consistency and query answering
Proceedings of the twenty-fourth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
A model for XML instance level integration
SBBD '08 Proceedings of the 23rd Brazilian symposium on Databases
On the Performances of Checking XML Key and Functional Dependency Satisfactions
OTM '09 Proceedings of the Confederated International Conferences, CoopIS, DOA, IS, and ODBASE 2009 on On the Move to Meaningful Internet Systems: Part II
Towards the preservation of functional dependency in XML data transformation
International Journal of Intelligent Information and Database Systems
DaWaK'10 Proceedings of the 12th international conference on Data warehousing and knowledge discovery
Towards evolving constraints in data transformation for XML data warehousing
ADBIS'09 Proceedings of the 13th East European conference on Advances in Databases and Information Systems
Presenting XML schema mapping with conjunctive-disjunctive views
WAIM'13 Proceedings of the 14th international conference on Web-Age Information Management
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Data integration is the problem of combining data residing at different sources, and providing the user with a virtual view, called global schema, which is independent from the model and the physical origin of the sources. Whereas many data integration systems and theoretical works have been proposed for relational data, not much investigation has been focused yet on XML data integration. Our goal is therefore to address some of its related issues. In particular, we highlight two major issues that emerge in the XML context: (i) the global schema may be characterized by a set of constraints, expressed by means of a DTD and XML integrity constraints, (ii) the concept of node identity requires to introduce semantic criteria to identify nodes coming from different sources. We propose a formal framework for XML data integration systems based on an expressive XML global schema, a set of XML data sources and a set of mappings specified by means of a simple tree language. Then, we define an identification function that aims at globally identifying nodes coming from different sources. Finally, we propose algorithms to answer queries under different assumptions for the mappings.