@inbook{P105.061, author={Pereira, Fernando and Van de Walle, Rik}, title={Multimedia Content Description in MPEG-7 and MPEG-21}, booktitle={Multimedia Content and the Semantic Web}, year={2005}, month={1}, pages={3-41}, editor={Stamou, G. and Kollias, S.}, publisher={John Wiley & Sons}, }