...:///data/sources/Python-3.1.1/Doc/build/html/reference/datamodel.html#descriptors]实现描述符（Implementing Descriptors）[/url] 。
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实现方案可通过描述符支持意图声明。
The implementation may support the declaration of intent through descriptors.
返回的对象还实现了MDB在它的部署描述符中声明的接口。
The object returned also implements the interface that the MDB declared in its deployment descriptor.
要部署业务对象，需要使用插件描述符将实现类放到系统类路径中。
To deploy a business component, the implementation classes need to be made available on the system classpath with a plug-in descriptor.
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