Thanks do you know where i can find simple example about this ?
http://www.google.com/search?hl=en&ie=UTF-8&q=xsl%3Achoose+xsl%3Awhen+xsl%3Aotherwise
or maybe you'd prefer
http://www.google.com/search?hl=fr&ie=UTF-8&q=xsl%3Achoose+xsl%3Awhen+xsl%3Aotherwise
--
The LaTeX Companion
http://www.awprofessional.com/bookstore/product.asp?isbn=0201362996
http://www.amazon.co.uk/exec/obidos/tg/detail/-/0201362996/202-7257897-0619804
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