Returns the number of members in the supplied array.
array:size( $array as array(*)xs:integerIf $array is empty the function returns zero.
Otherwise, the function returns the number of members in $array.
The expression array:size(["a", "b", "c"]) returns 3.
The expression array:size(["a", ["b", "c"]]) returns 2.
The expression array:size([ ]) returns 0.
The expression array:size([[ ]]) returns 1.
Note that because an array is an item, the fn:count function when applied to an array always returns 1 (one).
