Controlled vocabulary reference and/or values
ms:mediaType: text, audio, video, image
Specifies the media type of the resource and basically corresponds to the physical medium of the content representation. Each media type is described through a distinctive set of features. A resource may consist of parts attributed to different types of media. A component may take as input/output more than one different media types.
OpenMinTeD only handles text resources, so the default value is set to "text".