Maybe using a different example
// expands to different things
$actor/(//bar)
is
$actor/(fn:root(self::node()) treat
asdocument-node()/descendant-or-self::node()/bar)
$actor//bar
is
$actor/descendant-or-self::node()/bar
maybe it's clearer with / rather than //
$actor/(/)
is
$actor/root(.)
(more or less)
$actor//
is a syntax error.
David
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