code: protected void pdfA1A(PdfWriter writer) throws IOException, DocumentException, VectorPrintException {
        builtInFontHack();
        writer.setPdfVersion(PdfWriter.PDF_VERSION_1_4);
        writer.setTagged();
        writer.setPDFXConformance(PdfWriter.PDFX1A2001);
     }
docs: called as the last step from {@link #style(java.lang.Object, java.lang.Object) }, calls {@link #builtInFontHack()
  } which is necessary when creating PDF/X-1a with iText.
  
  @param writer
  @throws IOException
  @throws DocumentException
  @throws VectorPrintException