尽管看起来像是废话，但无论如何只能对单值数据使用xml属性。
It seems obvious to say, but you should use attributes in XML for single-value data.
在比较类名和属性名时，API会寻找容器内的单值，并区分大小写。
When it compares class names and attribute names, it looks for uniqueness in its container and USES case-sensitive comparisons.
name 属性是一个单值包容引用。
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