描述符指向组件的实现，在这种情况下是一个类文件，还包含组件需要的任何配置信息。
The descriptor points to the implementation of the component, in this case a class file, and also includes any configuration information that the component needs.
这个方法的优点是：自动安装LPAR所需的所有配置信息都包含在dhcpd . conf文件中。
The advantage of this approach is that all the configuration information for automatically installed LPARs is contained in the dhcpd.conf file.
本方法是建立在J2EE体系结构基础之上的，以XML文件作为配置信息的载体从而具有良好的移植性和可扩展性的特点。
This method is based on J2EE, and XML files are carriers of its configuration information. So it has good replantation and extensibility.
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