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Handbook of theoretical computer science (vol. B)
HILOG: a foundation for higher-order logic programming
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ACM Transactions on Database Systems (TODS)
SchemaSQL: An extension to SQL for multidatabase interoperability
ACM Transactions on Database Systems (TODS)
Denotational Semantics: The Scott-Strachey Approach to Programming Language Theory
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Toward logical data independence: a relational query language without relations
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
A Universal Relation Data Model with Semantic Abstractions
IEEE Transactions on Knowledge and Data Engineering
A Universal Relation Approach to Federated Database Management
ICDE '95 Proceedings of the Eleventh International Conference on Data Engineering
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
A survey of approaches to automatic schema matching
The VLDB Journal — The International Journal on Very Large Data Bases
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ACM SIGMOD Record
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ACM Transactions on Database Systems (TODS)
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ISMIS'05 Proceedings of the 15th international conference on Foundations of Intelligent Systems
Querying and browsing XML and relational data sources
Proceedings of the 2007 ACM symposium on Applied computing
The research and implementation of heterogeneous data integration under ontology mapping mechanism
WISM'11 Proceedings of the 2011 international conference on Web information systems and mining - Volume Part II
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Data integration systems provide a uniform query interface (UQI) to multiple, autonomous data sources [Alon Y. Halevy. Answering queries using views: A survey. The VLDB Journal, 10(4):270-294, 2001]. This paper presents the universal data model (UDM) that captures the semantically salient aspects of relational, entity-relationship, and XML data models. As a consequence, UDM - including its accompanying query language - provides a simple and elegant UQI for integrating data represented in some of the most widely adopted data models.