This allows the structure element to define an XML element with no corresponding object, or an object with no corresponding element.

这允许structure元素定义一个没有相应对象的xml元素，或者定义一个没有相应元素的对象。

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If there is no corresponding object or element, an object or element will be created and attributes will be set according to the mappings.

如果没有相关的对象或者元素，那么将会创建一个对象或者元素，并根据映射来设置属性。

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It can handle dependencies, such as the rule that if a source file is modified, its corresponding object file must be regenerated by recompiling the source.

它可以处理相关性，例如有这样的规则：如果源文件被修改，那么必须通过重新编译该源文件来重新生成其对应的目标文件。

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