These transformations group a setofmappings based on a given XPath expression condition.
这些转换根据给定的 XPath 表达式条件对映射进行分组。
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An MTF transformation results in a setofmappings that relate objects among different models; an object unbound to any mapping is considered out of the scope of the transformation.
The mapping table allows the user to perform scalar mappings, which is to perform restructures that do not have set semantics and that do not change the dimensions of the structures.