Spiridou, Anastasia; (2002) A CORBA-based mediation system for the integration of wrapped molecular biology data sources. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Integration of data from disparate, heterogeneous and autonomous data sources is a common problem encountered in different domains, including the domain of Molecular Biology. Mediator-based architectures have been developed to deal with integration of information from heterogeneous and autonomous data sources, and views have been used to restructure data representation. CORBA can resolve some of the problems involved in data integration by providing programming language, platform and network transparency. In CORBA, it is advantageous to model data itself in EDL, essentially creating IDL schemas. Integration of data served by different CORBA servers and modelled in IDL requires resolving schematic heterogeneity between the different DDL schemas. That involves mapping from one or more source IDL schemas to a preferred target IDL schema. Manual implementation of the mapping is possible but tedious. The system described in this thesis offers creation of customised representations of data and data integration on CORBA-wrapped data sources. Views are employed to restructure data representation. The system supports semi-automatic generation of target CORBA servers based on the specification of source to target IDL mapping in a specially developed language. The mapping language has a high-level notation for expressing mappings easily and concisely, as well as procedural features to support complex cases. The mediation system is applied to the integration of bacterial genome data from two independently developed CORBA wrapped data sources.

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