这类似于我们在正则表达式中使用“捕捉组”来提取我们需要的子字符串时来替代把一个字符串分隔成好几个的方法。
It is analogous to using "capture groups" in a regular expression to pull out substrings we want, instead of splitting the string in several successive steps to extract the substrings we want.
嵌套捕捉几乎可以捕捉任意深度的分段和子分段。
Nested captures capture segments and subsegments, to virtually any depth.
Process Server和WESB v6.2中引入的子流指一种在可重用流片段中捕捉一组中介步骤(原语，如图15所示)的方式。
Subflows, introduced in v6.2 of Process Server and WESB, are a way of capturing a set of mediation steps (primitives, like the ones in Figure 15) in a re-useable flow fragment.
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