The mapping table also allows the user to convert source types to target types, or define constant mappings that set constant values to items in the target schema.

映射表还允许用户将源类型转化成目标类型，或定义常量映射 来将常量设置为目标架构中的项目。

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An assign parameter mapping lets you specify a constant value to put in a target parameter.

赋值参数映射允许您指定一个常数值来放在目标参数中。

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Namespace prefixes are basically meaningless to anyone except the author of the original document and relying on a constant one-to-one mapping of namespace prefixes to URIs is unwise at best.

除了原始文档的作者外，名称空间前缀基本上对任何人都没有意义，依赖于名称空间前缀和URI之间的一致的一对一映射并不明智。

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