Components Taxonomy and Collaboration
Logical Structure
Business Layer
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System Layer

The system layer contains the actual middleware. These are XMLbroker server module, the application server with its EJB container and the Servlet engine. On the client application side, XMLbroker client module has the role of a proxy, abstracting the remote service to a local Java object. The delegate Java Bean holds a `glue' role between the a particular web service deployed on XMLbroker and set of Enterprise Java Beans, while preserving a level of indirection between them. As such, it represents the interface between the two layers.

Figure 3.3: UML deployment diagram for the proposed system