Finally, the business component implementation class is specified as the extension provider.
最后，业务组件实现类被指定为扩展提供者。
If this qualifier is not specified, then the implementation executes under the identity of its caller, or under the hosting container's identity if no caller identity is present.
如果限定符不能指定，那么实现以其调用者的身份执行，如果没有调用者身份，则以托管容器的身份执行。
If this property isn't defined, then the default implementation (whatever parser your vendor specified) is returned.
如果没有定义该属性，则返回缺省实现(供应商指定的任何语法分析器)。
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