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== Native XML databases ==
Native XML databases are especially tailored for working with XML data. As managing XML as large strings would be inefficient, and due to the hierarchical nature of XML, custom optimized data structures are used for storage and querying. This usually increases performance both in terms of read-only queries and updates.<ref>{{cite web|last1=Matthias|first1=Nicola|title=XML versus Relational Database Performance|url=https://nativexmldatabase.com/2010/08/22/xml-versus-relational-database-performance/|website=Native XML Database|access-date=28 Jun 2017|date=22 August 2010|archive-date=4 March 2017|archive-url=https://web.archive.org/web/20170304072744/https://nativexmldatabase.com/2010/08/22/xml-versus-relational-database-performance/|url-status=dead}}</ref> XML nodes and documents are the fundamental unit of (logical) storage, just as a [[relational database]] has fields and rows.
The standard for querying XML data per W3C recommendation is [[XQuery]]; the latest version is XQuery 3.1.<ref>{{cite web|url=http://www.w3.org/TR/xquery-31/ | title=XQuery 3.1 Recommendation | date=2017-03-21}}</ref> XQuery includes [[XPath]] as a sub-language and XML itself is a valid sub-syntax of XQuery. In addition to XPath, some XML databases support [[XSLT]] as a method of transforming documents or query results retrieved from the database.
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