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In the industrial world, the pure greenfield development project is a rare thing. In most cases, the greenfield portion of a new project must still interoperate with a legacy system or even multiple legacy systems. Today’s data driven operations rely on interconnected systems representing a mix of both proprietary and open technology.

This paper covers the basics of a layered databus, including the capabilities of layers, defining layers, connecting layers and decomposing layers. It also provides use cases from different industries on how the layered databus can be used to address legacy interoperability requirements without incurring the penalties of legacy design practices.