The Architecture chapter gave a brief description of the architecture and concepts of the xBus. Layers and Modules will provide details about all modules, the xBus consists of.

This chapter is structured along the layers introduced in the architectural description:

• Technical Layer - The receiver and sender modules to access the physical resources and protocols, eg. files or HTTP.
• Protocol Layer - The message and transformation modules to handle the data formats, eg. XML or record types.
• Application Layer - The modules to process the received message, eg. the Router.
• Base Functions - The base functions supporting all modules of the above mentioned layers.