The following attempts to show the relation of the various constants
used for mapping APR Status codes.

      0

 20,000     APR_OS_START_ERROR

        + APR_OS_ERRSPACE_SIZE (50,000)

 70,000      APR_OS_START_STATUS

        + APR_OS_ERRSPACE_SIZE - APR_UTIL_ERRSPACE_SIZE (30,000)

100,000      APR_UTIL_START_STATUS

        + APR_UTIL_ERRSPACE_SIZE (20,000)

120,000      APR_OS_START_USERERR

        + 10 x APR_OS_ERRSPACE_SIZE (50,000 * 10)

620,000      APR_OS_START_CANONERR

        + APR_OS_ERRSPACE_SIZE (50,000)

670,000      APR_OS_START_EAIERR

        + APR_OS_ERRSPACE_SIZE (50,000)

720,000      APR_OS_START_SYSERR