Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Object orientation in multidatabase systems
ACM Computing Surveys (CSUR)
The object database standard: ODMG 2.0
The object database standard: ODMG 2.0
The Unified Modeling Language user guide
The Unified Modeling Language user guide
&lgr;-DB: an ODMG-based object-oriented DBMS
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
C++ Object Databases: Programming the ODMG Standard
C++ Object Databases: Programming the ODMG Standard
Metadata management in federated multimedia systems
ADC '02 Proceedings of the 13th Australasian database conference - Volume 5
Research in information managment at Dublin City University
ACM SIGMOD Record
Integrating View Schemata Using an Extended Object Definition Language
CooplS '01 Proceedings of the 9th International Conference on Cooperative Information Systems
Metadata usage in multimedia federations
MIS'02 Proceedings of the 2002 international conference on Metainformatics
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A Federated Information System requires that multiple (often heterogenous) information systems are integrated to an extent that they can share data. This shared data often takes the form of a federated schema, which is a global view of data taken from distributed sources. One of the issues faced in the engineering of a federated schema is the continuous need to extract metadata from cooperating systems. Where cooperating systems employ an object-oriented common model to interact with each other, this requirement can become a problem due to the type and complexity of metadata queries. In this research, we specified and implemented a metadata software layer in the form of a high-level query interface for the ODMG schema repository, in order to simplify the task of integration system engineers. Two clears benefits have emerged: the reduced complexity of metadata queries during system integration (and federated schema construction) and a reduced learning curve for programmers who need to use the ODMG schema repository.