This is a list of the most commonly used media types in the world. http://static-content.springer.com/image/art%3A10.1186%2F1467-4866-2-45/MediaObjects/12932_2001_Article_17_Fig2_HTML.jpg
http://static-content.springer.com/image/art%3A10.1186%2F1467-4866-2-45/MediaObjects/12932_2001_Article_17_Fig2_HTML.jpg