Since the launch of XML Sitemaps in 2005, Google has added several specialized formats with the aim to better accommodate the various types of content like video, images, mobile, code or geographic content. Until this time users had no option but to create different sitemaps for the various content types but now they can create and submit a single XML Sitemap for all of your content types.
The structure of the sitemap with multiple content types differs from the standard sitemap only in one respect i.e. it possesses capacity to contain URLs referring to varied content types. The process of the submission will also remain same. The only thing which has changed is that users can now add various types of content to one file because unlike the previous method, sitemaps will now come equipped with a capacity to handle URLs for different content types.