The Behavior Markup Language: Recent Developments and Challenges. - Hannes Högni Vilhjálmsson; Nathan Cantelmo; Justine Cassell; Nicolas Ech Chafai; Michael Kipp; Stefan Kopp; Maurizio Mancini; Stacy Marsella; Andrew N. Marshall; Catherine Pelachaud; Zsófia Ruttkay; Kristinn R. Thórisson; et al. (IVA, 2007)