每一条边都被一个64位的位置信息标识，用于排序。
Each edge is also marked with a 64-bit position, used for sorting.
身份上下文信息标识首次将消息放入队列的应用程序的用户。
Identity context information identifies the user of the application that first put the message on a queue.
信息编码具有信息标识标准化的能力，但是在信息表达上能力不足，限制了信息编码的作用。
Information coding can standardize the information identity, however, it is lack of capacity in information expression, which limits the role of information coding.
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