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# XML 元素
> 提取元素并显示 XML 文档的结构。
> 更多信息:<https://xmlstar.sourceforge.net/docs.php>。
- 从 XML 文档中提取元素(生成 XPATH 表达式):
`xml elements {{path/to/input.xml|URI}} > {{path/to/elements.xpath}}`
- 从 XML 文档中提取元素及其属性:
`xml elements -a {{path/to/input.xml|URI}} > {{path/to/elements.xpath}}`
- 从 XML 文档中提取元素及其属性和数值:
`xml elements -v {{path/to/input.xml|URI}} > {{path/to/elements.xpath}}`
- 打印从 XML 文档中排序后的唯一元素,以查看其结构:
`xml elements -u {{path/to/input.xml|URI}}`
- 打印从 XML 文档中排序后的唯一元素,深度限制为 3
`xml elements -d{{3}} {{path/to/input.xml|URI}}`
- 显示帮助信息:
`xml elements --help`