new_contents: from django.contrib.sitemaps import Sitemap
  from djangobb_forum.models import Forum, Topic
  
  
  class SitemapForum(Sitemap):
      priority = 0.5
  
      def items(self):
          return Forum.objects.all()
  
  
  class SitemapTopic(Sitemap):
      priority = 0.5
  
      def items(self):
          return Topic.objects.all()
subject: move sitemap to core