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The lookup operator (?) has not (yet) made it into the precedence list under A.4. Can it be included?
Ouch! I'll have to fix that.
See https://lists.w3.org/Archives/Member/w3c-xsl-query/2015Mar/0006.html for a list of 2 needed changes and 1 possible change to the precedence table. The first has since been done.
Fixed.