I found quite a lot of information about copying a survey, modifying the questions and also the different texts.
I want to export the newly created survey as quexml pdf using a specified style.
I was not able to find any examples about the function.
Interesting. I have used the API via R and not directly accessing the routines.
My first impression is that the API section you're pointing to is not exposed to be used via the remote interface. Hopefully I'm wrong and someone will provide a solution.