Rules with this context
- JATS-0031-018(
ali:free_to_read,ali:license_ref) should not have a start_date or end_date attribute - JATS-0031-014ali:free_to_read should not be duplicated
- JATS-0031-016end_date attribute if present must contain a valid date in YYYY-MM-DD format
- JATS-0031-015start_date attribute if present must contain a valid date in YYYY-MM-DD format
- JATS-0031-017start_date must not be after end_date if both attributes are present