Yes, although the post system belongs to employees, it is not a traditional occupation, nor does it belong to "contract workers" or "temporary workers". It belongs to the establishment itself, and the entry and exit of the establishment need to be handled in accordance with the prescribed procedures. It is a separate establishment derived from public institutions in order to cut off "only entering but not leaving", because the work of the library is relatively stable. So in order to avoid the situation of only getting in and out, the post system is adopted.