In short, you have room for another layer of abstraction here, implemented as two XSLT stylesheets to be applied in sequence.
简言之，您拥有在此处放置抽象层的空间，可以实现为两个按顺序应用的xslt样式表。
A sequence diagram showing only one layer.
只显示一个层的序列图。
Figure 11: Design sequence diagram with persistence layer.
图11：带有持续层的设计序列图。
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