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This bug entry is raised as an umbrella entry for spec changes that are needed to keep the specifications of maps in XSLT 3.0 and XPath 3.1 aligned. The WG has agreed that the map lookup operator (?) - both unary and infix versions - will be added to XSLT 3.0. Other changes include a change in namespace used in the XML representation of JSON.
For reference, the original mail outlining this proposal is https://lists.w3.org/Archives/Member/w3c-xsl-wg/2015Jul/0012.html and the XSLWG decision was made during the telcon of July 9, 2015, minutes: https://lists.w3.org/Archives/Member/w3c-xsl-wg/2015Jul/0017.html (both member only).
Note that in the Change Log, against bug 24266, there is a TODO reminding us that we have not defined streamability rules for new expressions and functions in XPath 3.1.
The changes needed for alignment have been made and this bug can now be closed.