The response template contains a type safe subset of the value object information graph requested by the user in the request template.
响应模板中包含类型安全的值对象信息图子集，这些信息是用户在请求模板中请求的。
A data object is signed by computing its digest value and a signature over that value.
资料物件的签名是透过计算其摘要值并对该值的签名进行的。
The EJB specification states that the key must be a unique value represented by a serializable object.
EJB规范规定：主键必须是一个可序列化的对象所表示的独一无二的值。
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