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# Project Architecture

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The project type you choose determines the type of descriptors and mappings you can use. There is a project type for each data source type that TopLink supports.

Table: Project, Descriptor, and Mapping Support summarizes the relationship between project, descriptor, and mappings.

Project, Descriptor, and Mapping Support

Project | Descriptor | Mapping
--- | --- | ---
Relational Projects | Relational Descriptors Object-Relational Descriptors | Relational Mappings Object-Relational Mappings
EIS Projects | EIS Descriptors | EIS Mappings
XML Projects | XML Descriptors | XML Mappings