As we can see in the first figure, in the middle we have an object hierarchy called the
AxisService hierarchy. This particular hierarchy is created using a
services.xml file or the service descriptor and the hierarchy contains four types of descriptions.
When we deploy a service into Axis2, an object hierarchy will be created and added to
AxisConfiguration. Therefore, unless we have services deployed in Axis2, we do not have the service objects hierarchy in the
AxisModules and other descriptions (for example, transports and message formatters), the service description hierarchy is likely to be changed at runtime, depending on the deployment options. A typical
services.xml is shown next to ...