Property mediaType : WideString; (Read/Write)
Identifies the type of the encapsulated data and can be used to determine a method to interpret or render the content.
The IANA defined domain of media types is established by the IETF RFCs 2045 and 2046. mediaType has a default value of text/plain and cannot be null. If the media type is different to text/plain, the mediaType attribute SHALL be populated.
If the content is compressed using a specified compression algorithm, the mediaType SHALL refer the mediaType of the uncompressed data, whether the data is accessed by reference or not.