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.
与此相关的问题之一就是性能，因为Web服务请求往往较慢，将两个请求包含在同一个页面中必然会对速度造成负面影响。
One of the problems with this involves performance because Web service requests are rarely fast, and including two of them in a single page can really slow things down.
如果初始的decision确实是包含性的，而且激活了两个分支，则会有问题出现。
A problem occurs if the initial decision is indeed inclusive and activates both branches.
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