> 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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