Proprietary Sys.= XML= XSL-FO= PDF In memory transform

Question

I am trying to preform an in memory creation of a pdf (using XSL-FO and FOP) from data contained in a proprietary system.
The process I am using is:
1: get xml of the data in the proprietary system (this works and the xml is fine)
2: create the XSL-FO using the xml from stage 1 and an xslt (where I am going wrong)
3: transform the xml to pdf (this works if I save the XSL-FO.xml and the xslt used to disk and then run FOP seperately)
When I run the code I get a Fatal Error from FOP - Content not allowed in prolog. When I write the XSL-FO file to disk and look at it, it's not been transformed to XSL-FO and is missing all the mark-up.
I have put the code below - any help would be very appreciated.
Thanks
// Setup XML input - The methods to create the initial xml return a String
StringReader inSource = new StringReader( inResult );
// Setup XSLT Stylesheet - The fo styles are stored in the proprietary system
String foXSL = getStyleSheet("FOStyleSheet");
ByteArrayOutputStream foXMLba = new ByteArrayOutputStream();
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer( new StreamSource( new StringReader( foXSL ) ) );
Result foRes = new StreamResult( foXMLba );
transformer.transform( new StreamSource( inSource), foRes );
Driver driver = new Driver();
driver.setRenderer( Driver.RENDER_PDF );
ByteArrayOutputStream pdfOut = new ByteArrayOutputStream();
driver.setOutputStream( pdfOut );
driver.setInputSource( new InputSource( in_foResult ) );
driver.run();

Answer 1

an xslt (where I am going wrong)Yes, I would say that's a good guess at your problem. It does indeed sound like one of the common XSLT errors, where none of your templates are being matched and the default handling takes over; all that does is to copy the text nodes to the output.
PC²