[variable-type] should come from the XML Schema base data types.
[variable - type]应该是XML Schema基本数据类型。
The interpreter can infer variable type based on its use.
解释器可以根据用法来推断变量的类型。
Arrays are typed, and so you know exactly what variable type is going to be needed for each item in the array.
数组被类型化，所以您需要很清楚地知道数组中每个项目的变量类型是什么。
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