共支持全部三种签名模式：封外、封内以及分离模式。
All three modes of signatures — enveloping, enveloped, and detached — are supported.
有很多将系统分解为几部分并找出每个部分的好的签名模式的可能。
There are many opportunities to decompose the system into a few parts and find a good signature pattern for each part.
不过，考虑系统的子集时，通常会发现对整个子系统都适用的签名模式。
When you consider subsets of the system, however, you can often find a signature pattern that works quite well for the subsystem.
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