tra prediction only. G.3.14 EP slice: A slice that may be decoded using intra prediction or inter prediction or inter-layer prediction from syntax elements and derived variables of the reference layer representation. For inter-prediction of EP slices at most one motion vector and reference index is used to predict the sample values of each block. G.3.15 field macroblock: A macroblock containing samples from a single field or layer field. G.3.16 frame macroblock: A macroblock containing samples from the two fields or layer fields of a frame or layer frame, respectively. G.3.17 I slice: A slice that is decoded using intra-layer intra prediction only. G.3.18 instantaneous decoding refresh (IDR) picture: A coded picture for which the variable IdrPicFlag is equal to for the target dependency representation. An IDR picture causes the decoding process to mark all reference pictures as "unused for reference" immediately after the decoding of the IDR picture. All coded pictures that follow an IDR picture in decoding order can be decoded without inter prediction from any picture that precedes the IDR picture in decoding order. The first picture of each coded video sequence in decoding order is an IDR picture. G.3.19 inter-layer intra prediction: An inter-layer prediction derived from decoded samples of intra-coded macroblocks of the reference layer representation. G.3.20 inter-layer prediction: A prediction derived from syntax elements, derived variables, or decoded samples of the reference layer representation. G.3.21 intra-layer intra prediction: A prediction derived from decoded samples of the same decoded slice. G.3.22 intra prediction: A collective term for intra-layer intra prediction or inter-layer intra prediction or a combination of intra-layer intra prediction together with inter-layer prediction from syntax elements and derived variables of the reference layer representation. G.3.23 intra slice: A collective term for I slice or El slice. G.3.24 layer bottom field: One of two layer fields that comprise a layer fr