I am trying to use the library integrated within my server that has
being developed in C++ with other libraries for other conversions. I
don't know if the xsltproc would work well for what I need. The
decision (of which conversion will be made) is done along in the code
and than I call one or another library.

Does anyone know how to do it? How I can apply a stylesheet to convert
xml to wml? The xml is stored in a char *. How can I create a
stylesheet?

Try putting the words "libxslt" and "tutorial" into Google.
--
g
, Chris Burdess
  "They that can give up essential liberty to obtain a little safety
  deserve neither liberty nor safety." - Benjamin Franklin