The mime subtype for a graphic, multimedia object, or piece of supplementary material
Although the Tag Set cannot enforce it, the element <graphic> should be limited to still images. The element <media> should be reserved for objects whose @mime-subtype involves video, audio, moving images, time-dependent graphic types, and other non-XML data types. Mimetypes and subtypes should be set accordingly but are not constrained by this Tag Set.
The source for this attribute’s values is the Internet Assigned Numbers Authority (IANA 2003).
|Computer Graphics Metafile
|CompuServe Graphic Interchange Format
|Joint Photographic Experts Group raster
|Portable Network Graphics
|Tag Image File Format
|Restriction: This attribute may be specified if the element is used.