[Barcode4j-users] Which extension should I use ?

[<chr...@vi...>]

Hello,
I'm using FOP (in a Servlet) and I need to edit barcodes. Until now, I 
process XSL-FO from XML+XSLT (XML2PDF) with the code provided by the FOP 
site :

*****************************************************************
                driver.setOutputStream(out);
   
                // Setup XSLT
                TransformerFactory factory = 
TransformerFactory.newInstance();
                Transformer transformer = factory.newTransformer(new 
StreamSource(xsltfile));
               
                // Set the value of a <param> in the stylesheet
                transformer.setParameter("versionParam", "2.0");
           
                // Setup input for XSLT transformation
                Source src = new StreamSource(xmlfile);
           
                // Resulting SAX events (the generated FO) must be piped 
through to FOP
                Result res = new SAXResult(driver.getContentHandler());
   
                // Start XSLT transformation and FOP processing
                transformer.transform(src, res);


        ********************************************************************

1) I think that the Xalan extension will be used during the XSLT step 
(without any code change in the servlet), am I wrong ?
2) If I want yo use the FOP extension, will I have to divide the PDF 
generation in 2 steps in my servlet (XML2FO and FO2PDF) ?
3) If I want to rotate the barcodes, is the xalan extension the only 
solution ?
4) Refering to the last message in the forum (Can Barcode4j grab 
fo:page-number from FOP), I have a client who would like to have a 
barcode on the first page of its edition containing the total number of 
pages. So my last question is : Can Barcode4j grab 
<fo:page-number-citation ref-id="last-page"/> from FOP ?

Thanks for ypour reply and congratulations for your work (in Barcode4j 
and fop)!