For more information, see Value Types.
有关更多信息，请参见值类型。
Values of these types can come from the input document of a transformation, if schema awareness is in effect (see Schema awareness further ahead), or as the return value of a function.
如果启用了模式感知（参阅后面的 模式感知），这些类型的值可以来自转换的输入文档或者函数的返回值。
Boards have the highest scrap value in them so you can actually see on the back you're looking at different types of metals.
你只要看看线路板背面各种不同的金属就可以得知，线路板的废料价值最高。
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