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The XML Query Working Group and XSLT Working Group have published a Proposed Recommendation for four documents:

XQuery and XPath Data Model 3.1: 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. The XQuery and XPath Data Model 3.1 (henceforth “data model”) serves two purposes. First, it defines the information contained in the input to an XSLT or XQuery processor. Second, it defines all permissible values of expressions in the XSLT, XQuery, and XPath languages.
XPath and XQuery Functions and Operators 3.1: The purpose of this document is to catalog the functions and operators required for XPath 3.1, XQuery 3.1, and XSLT 3.0. It defines constructor functions, operators, and functions on the datatypes defined in XML Schema Part 2: Datatypes Second Edition and the datatypes defined in XQuery and XPath Data Model (XDM) 3.1. It also defines functions and operators on nodes and node sequences as defined in the XQuery and XPath Data Model (XDM) 3.1.
XML Path Language (XPath) 3.1: XPath 3.1 is an expression language that allows the processing of values conforming to the data model defined in XQuery and XPath Data Model (XDM) 3.1. The name of the language derives from its most distinctive feature, the path expression, which provides a means of hierarchic addressing of the nodes in an XML tree. As well as modeling the tree structure of XML, the data model also includes atomic values, function items, and sequences.
XSLT and XQuery Serialization 3.1: This document defines serialization of an instance of the data model as defined in XQuery and XPath Data Model (XDM) 3.1 into a sequence of octets. Serialization is designed to be a component that can be used by other specifications such as XSL Transformations (XSLT) Version 3.0 or XQuery 3.1: An XML Query Language.

Comments are welcome through 28 February 2017.