xml to pdf with fop

Hi                                                                                                                         
                                                                                                                           
My goal is to produce pdf from a (xslt transformed) xml file and xsl giving                                                
the style instructions.  Fop looks like the right choice, however it seems                                                 
to _not_ require the xslt viz.                                                                                             
                                                                                                                           
One is to first use an XSLT engine to produce the formatting object tree as                                                
an XML document and then running the class com.jtauber.fop.apps.CommandLine                                                
with the formatting object file name and PDF filename                                                                      
as arguments. You will need to include FOP, SAX and your SAX Parser in your                                                
classpath and so you might invoke                                                                                          
                                                                                                                           
java -cp fopxxx.jar;sax.jar;xp.jar com.jtauber.fop.apps.CommandLine formatting-tree-file pdf-file                          
                                                                                                                           
I am confused, where does the xsl file come into it?                                                                       
                                                                                                                           
Thanx  


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