My websites currently have a sitemap XML file that use the rel="alternate" to indicate there is an alternate location to my content in another country and language.
I am wondering what the best practice is. Should I create a separate Image sitemap XML file or simply add the image information ( etc.) to the current Sitemap XML file that uses rel="alternate".
I ask because there are 10 different websites so I already see the XML file with lots of information because of the rel="alternate". Is there a best practice or is either way perfectly fine?
Thanks in advance.