Other times, they are like extension to the rules.
另外一些时候，他们看起来象是扩展了规则。
You define the rules for the transformation in a text file with the extension .rdl.
我们在扩展名为 .rdl的文本文件中定义转换的规则。
Notice the new rules: extension attribute.
请注意新的rules：extension属性。
Notice the new rules: extension attribute.
请注意新的rules：extension属性。
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