Returns a new sequence containing all the items of $target except the item
            at position $position.
fn:remove( $target as item()*,$position as xs:integeritem()*The function returns a sequence consisting of all items of $target whose
            index is less than $position, followed by all items of $target
            whose index is greater than $position. 
let $abc := ("a", "b", "c")
The expression fn:remove($abc, 0) returns ("a", "b", "c").
The expression fn:remove($abc, 1) returns ("b", "c").
The expression fn:remove($abc, 6) returns ("a", "b", "c").
The expression fn:remove((), 3) returns ().
If $position is less than 1 or greater than the number of items in
               $target, $target is returned.
If $target is the empty sequence, the empty sequence is returned.