Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Information Integration Using Logical Views
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
Constraint-based XML query rewriting for data integration
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Efficient query reformulation in peer data management systems
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Composing schema mappings: second-order dependencies to the rescue
PODS '04 Proceedings of the twenty-third ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Composing mappings among data sources
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Management of executable schema mappings for XML data exchange
EDBT'06 Proceedings of the 2006 international conference on Current Trends in Database Technology
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In data integration systems there is a problem of answering queries through a target schema, given a set of mappings between source schemas and the target schema, and given that the data is at the sources. This is of special importance when integrated sources, e.g. from Web data repositories, have overlapping data and its merging is necessary. We propose a language for specifying a class of mappings between source and target schemas, and design rewriting rules which reformulate a target query to a query over data sources based on the mappings.