当WSDL描述一个对象时，每一个部分映射到一个方法调用的参数上。
When WSDL describes an object, each part maps to an argument of a method call.
因为这一特性是一个系统对象的名称，所以在发布操作时，开发团队和管理员就可在部署描述符中指定这些特性的值。
Because this property is the name of a system object, the development team and the administrators can specify the value of these properties in the deployment descriptor during a publish operation.
当关于某实例的所有文件描述符都关闭时，资源和下层对象都将释放，以供内核再次使用。
When all file descriptors for an instance are closed, the resources and underlying object are freed so the kernel can reuse them.
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