问题就在于此：数字签名依赖于字节级的等价测试，但是可能有两个逻辑上相同但包含不同字节序列的XML文档。
Herein lies the problem: Digital signatures rely on byte-level equivalence, whereas it is possible to have two XML documents that are logically the same, but contain different byte sequences.
这个例子依赖于映射不常用的字符，如左尖引号（«，通常编码为 «），并假设这样的字符不出现在结果序列中。
This example relies on mapping infrequently used characters such as a left angled quote («, often coded as «) and assumes that such characters do not appear in the resulting sequence otherwise.
典型的真实业务工作流程中的任务序列在本质上是动态的：该序列通常不是固定的，依赖于只有在执行期间才能决定的因素。
The sequence of tasks in a typical real-world business workflow is dynamic in nature: the sequence is normally not fixed and depends on factors that can be decided only during execution.
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