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We state in ยง18.2.3 2(d): Return the value of the expression in the next-value attribute of Q, evaluating the expression with a singleton focus set to $event("node") and with a dynamic context that binds the variable whose name is the accumulator name to the value $value The last phrase is nonsense. It should say "that binds the variable whose name is Q{}value to the value of the argument $value". Since this is a formal definition we should perhaps define the static and dynamic context rather more pedantically. As a minimum, we should make it clear that the argument $event is NOT available directly.
At WG direction, fixed editorially.