For SEO purposes sometimes we need to create chronological sitemap of nodes. Great sites like New York Times and other use this technique. Now any drupal site also can create chronological sitemap using this module https://drupal.org/project/chrono_sitemap. Here is description what this module does.
Hi! When we use continuous integration and work on multiple environments at once we need to set all our changes itno code. Sometimes features module help us with this, sometimes we need to use update hooks. In case of xmlsitemap module we need to use update hooks. If we need to set priority on content type or delete content type from sitemap.xml file we can use code given below. On picture you can see administration interface of xmlsitemap module yoursite.com/admin/config/search/xmlsitemap/settings.
Hi, sometimes we need to do something extra, especially when we need to make some SEO. In drupal we have wonderfull xmlsitemap module. So sometimes an output of this module is not very good for us. We need to change priorities and change frequencies. Good news for us is that to set priority we can use administration interface, but frequency can be set only for front page. Some taxonomy pages also could be changed frequently but xmlsitemap module don't use it.