 reads an IF file and renders it to a PDF file. Please note, that in normal
        FOP operation you're shielded from having to instantiate the FontInfo object yourself. This
        is normally a task of the AreaTreeHandler which is not present in this scenario. The same
        applies to the AreaTreeModel instance, in this case an instance of a subclass called 
        RenderPagesModel. RenderPagesModel is ideal in this case as it has very little overhead 
        processing the individual pages. An imp