例如，如果需要通过电子邮件将一个通知发送给每个符合条件的有记录的帐户，那么很容易在应用程序中对xml格式的客户电子邮件地址列表进行迭代。
For example, if you need to E-mail a notice to every qualifying account you have on record, then iterating through a list of customer E-mail addresses in XML format is easy to do in an application.
但因为XML文档在块级别格式中是从任意位置断开的，因此有必要记录打开元素(块在其中开始)的堆栈。
But since XML documents are broken at arbitrary positions in the block-level format, it is necessary to record a stack of open elements where a block begins.
尽管记录过程定制的方法有许多，但是没有一种方法是被大家视作标准化的，而且各家公司或者实现机构必须创建自己的格式来描述扩展。
Although there are many ways of documenting process customizations, none is considered standard, and each organization or implementation must create its own format for describing extensions.
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