MPEG-DASH allows for efficient transmission of layered codecs, such as the Scalable Video Coding (SVC) and Multiview Video Coding (MVC). For efficient transmission of layer codecs, each of the layers is described by a different representation. Enhancement layers/views are considered dependent Representations that depend on representations that contain lower layers, referred to as complementary Representations. The dependency on other representations is indicated in the MPD by the dependency_id (dep_id in the following figures), which indicates additional Representations that need to be downloaded to be able to decode a dependent Representation.