I suspect that the expected result of test last-23

<?xml version="1.0" encoding="UTF-8"?>Jane Doe 5 John Doe 6 Jane Doe 7 John Doe 8 Jane Doe 9 John Doe 10 Jane Doe 11 John Doe 12 Jane Doe 13

is wrong as it contains no <overtime> elements in the result.

(: Name: last-23 :)
(: Description: Evaluation of "last()" within a positional predicate :)
(: Author: Michael Kay :)

(: insert-start :)
declare variable $input-context1 external;
(: insert-end :)

for $h in ($input-context1/works)
  return $h/employee[position() = 5 to last()]/overtime