Optionally you can also change the variable type name to be different than its mapping columns data type (See Figure 17).

还可以将变量类型改为与它所映射的列的数据类型不同的类型(见图17)。

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So although mapping to a more general type is always safe, mapping back to a specialized type can be problematic: the specialized type has more rules, which make the content specialized.

因此虽然映射到更一般化的类型是安全的，但是再映射回专门化类型时可能会出现问题：专门化类型有更多的规则使得内容专门化。

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In Listing 5, we list the contents of a type map used to provide the mapping necessary to serve different versions of our article based on language and media type.

在清单5中，我们列出了用来提供必要映射的类型映射的内容，这些必要映射根据语言和媒体类型的不同，提供我们文章的不同版本。

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