Component consumers define references to target the functions they need to invoke without specifying target components, implementation technology or the protocol used to access them.

组件使用者定义了引用来指向需要调用的函数，无需指定目标组件、实现技术或者访问它们所使用的协议。

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SECLABEL_BY_COMP: This function builds a security label (internal encoded representation) by specifying a security policy and values for each of the components in the label.

SECLABEL_BY_COMP：该函数通过指定一个安全策略，并在标签中为每个组件指定值，从而构建一个安全标签(内部编码表示)。

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By specifying special annotations, developers can create POJO classes that are EJB components.

通过详细说明这些特殊的注解，开发者可以创建e JB组件的pojo类。

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