nested rules 嵌套规则
Although those nested initialization items obey the details of the specified DTD validity rules, they are rather cumbersome.
尽管那些嵌套的初始化项遵从指定的DTD有效性规则的详细信息，但它们还是有点麻烦。
As you have seen, rules are often nested in nature. Fragments of rules may be highly reused.
规则常常是嵌套的，常常需要重用一些规则的片段。
Figure 23 shows the output rules for the functional map named Func_Line1. This map USES nested instances of the WORD function to extract the Tag and value for each XML element.
图23显示功能性映射Func_Line1的输出规则。
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