# Constants
A page is changed always.
A page is changed every day.
A page is changed every hour.
A page is changed every month.
A page is changed never.
Change frequency constants set describes how frequently a page is changed.
Change frequency constants set describes how frequently a page is changed.
Change frequency constants set describes how frequently a page is changed.
Change frequency constants set describes how frequently a page is changed.
A page is changed every week.
A page is changed every year.