There is no category name found in the file sitemap.xml. For example, you have categories like bugsbunny, daftduck, donaltrump, but there is no such URL in the sitemap. Instead, you have:
yoursite.com/questions/bugsbunny
yoursite.com/questions/daftduck
yoursite.com/questions/donaltrump
So, the urls for category pagination follow the same traits.
