1. 查询：
XQuery 是用于查询 XML 数据的语言。它用于访问以 XML 格式存储的信息。它用于从将在 Web 服务(如 SoapUI)中使用的数据库中获取信息、接收将与应用程序集成一起使用的数据表单数据库、生成汇总报告、从 XML 文件中检索相关信息。 XQuery 由 W3C 设计并于 2007 年首次出现。
2. XSLT ：
XSLT 代表可扩展样式表语言转换。它是一种旨在访问树结构的语言。 XSLT 用于将 XML 数据从一种格式自动转换为另一种格式。当您将 XSLT 应用于 XML 文档时，您将获得另一个 XML 文档、HTML、文本或任何其他技术文档。它的代码写在 XML 文档中。我们可以说 XSLT 文档类似于 XML 文档。
XQuery 和 XSLT 的区别：
| S.No. | XQuery | XSLT |
|---|---|---|
| 1. | XQuery is program driven language. | XSLT is document-driven language. |
| 2. | It is not written in XML. | It is written in XML. |
| 3. | It is easy to learn. | It is difficult to learn. |
| 4. | It is declarative. | It is functional. |
| 5. | It is used only for simple transformations. | It is language that was designed to access tree structures. |
| 6. | It is not used to retrieve results in tree structure. | It is used to retrieve results in tree structure. |
| 7. | It is good to access XML database. | It is used to transform XML documents. |
| 8. | It is shorter, faster and more elegant for huge data jobs. | It may be difficult to maintain unless you carefully designed your stylesheet. |
| 9. | It is designed for retrieving and interpreting information according to the specification. | It is mainly designed for transforming the XML documents. |