MHEG is another working group under the same ISO/IEC subcommittee that feature the MPEG. The MHEG is the Working Group 12 (WG 12) of Subcommittee 29 (SC 29) of the joint ISO and IEC Technical Committee 1 (JTC 1). The ISO/IEC standards produced have number 13522. MHEG targets coding of multimedia and hypermedia information, and defines an interchange format for composite multimedia contents. The defined MHEG format encapsulates a multimedia document, so to speak, as communication takes place in a specific data structure. Despite the talk about multimedia, there is not very much said and written about MHEG, which seems odd given the realm of MHEG. The present market significance of MHEG is very low, probably due to the high number of proprietary standards for audio visual representation in multimedia PC environments.