修复根源起因通常是最佳的方法。
我将模板匹配从 / 修改为 Invoice，这样就不需要在每个 XPath 表达式的开头部分重复根元素名称。
I've changed the match on the template from / to Invoice so that I don't have to repeat this root element name at the start of each XPath expression.
次一个重要的问题是怎样预知正根，负根和复根的个数。
The next significant question was how to predict the number of positive, negative and complex roots.
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