典型的JET模板的第一行会将其转换为一个更适合的类，如清单2所示。
The first line of a typical JET template will be to cast this to a more appropriate class, as shown in Listing 2.
第1行用“match”属性定义在转换过程中将允许使用该模板的元素。
Line 1 defines, with the "match" attribute, the element that will allow the use of this template in the transformation process.
主模板使用row - spec收集作为行基础的所有元素。
The main template USES row-spec to gather all the elements that serve as the basis of the rows.
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