What is most important for an Emotion Markup Language?

@inproceedings{pub3979,
    author = {

Schröder, Marc
 and 

Wilson, Ian
 and 

Jarrold, William
 and 

Evans, Dylan
 and 

Pelachaud, Catherine
 and 

Zovato, Enrico
 and 

Karpouzis, Kostas
},
    editor = {

Reichardt, Dirk
},
    title = {What is most important for an Emotion Markup Language?},
    booktitle = {Proceedings of the 3rd Workshop on Emotion and Computing. Workshop on Emotion and Computing, befindet sich KI 2008, September 23-26, Kaiserslautern, Germany},
    year = {2008},
    pages = {9--16},
    note = {ISSN 1865-6374}
}