XML publisher And OAF

 I have a oaf view page , where I exceute query from 2 VOs to display data.

Some web beans are rendered based on which record needs to be viewed.

I want to import data on this page into a pdf file, though a click of a button.

I have gone through   many threads on OTN and many other blogs that talk about how to do this. I was able to get to a point where my xml was getting generated through oaframework, designed a template based on the xml output , registered it in publisher, and handle the logic of converting it into pdf through page's controller. I got to a point where the pdf open/save dialogue pops up and then it says --invalid format. I have tried high and low, but havent been able to do this.