The third version, published on 8 April 2014, was the first to carry its own version number, 3.0.
This version 3.1 is a revision of 3.0 that adds additional functions and operators, notably to work with the new datatypes of maps and arrays.
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This enhances the functionality and interoperability of the Web.
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It also defines functions and operators on nodes and node sequences as defined in the [XQuery and XPath Data Model (XDM) 3.1].
These functions and operators are defined for use in [XML Path Language (XPath) 3.1] and [XQuery 3.1: An XML Query Language] and [XSL Transformations (XSLT) Version 3.0] and other related XML standards.
The exact syntax used to call these functions and operators is specified in [XML Path Language (XPath) 3.1], [XQuery 3.1: An XML Query Language] and [XSL Transformations (XSLT) Version 3.0].
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It is a stable document and may be used as reference material or cited from another document.
W3C's role in making the Recommendation is to draw attention to the specification and to promote its widespread deployment.