Greeting, i am running a forum, but my question is, in order to generate a sitemap, I have two options. Option 1 i have a hourly renew sitemap, which will listed with all the latest post wihin 24 hours Option 2 I have a sitemap which list ALL the sub forum entry url. So, I might aspect this url WON'T update within 6-12 months. And we know that after the spider craw the forum link, it can get lots of latest post threads, which may update hourly So, my question is, which should be the correct way in generating an sitemap.xml? Thanks