This document defines the XQuery and XPath Data Model 3.1, which is the data model of [XML Path Language (XPath) 3.1], [XSL Transformations (XSLT) Version 3.0], and [XQuery 3.1: An XML Query Language] , and any other specifications that reference it. This document is the result of joint work by the [XSLT Working Group] and the [XML Query Working Group].