The code below will create a PDF from HTML. The problem is that when the document is tagged the TH tags are written to the PDF as a TD. Is there anyway to get the tags in the PDF to appear as TH? 

```
          string html = @"<table>
                            <tr>
                                <TH> header1 </TH>
                                <TH> header2 </TH>
                                <TH> header3 </TH>
                            </tr>
                            <tr>
                                <td> col 1</td>
                                <td> col 2</td>
                                <td> col 3</td>
                            </tr>
                        </table>";

        FileStream fs = new FileStream(@"C:\\test.pdf", FileMode.Create);
        TextReader reader = new StringReader(html);

        Document document = new Document(PageSize.A4, 30, 30, 30, 30);

        PdfWriter writer = PdfWriter.GetInstance(document, fs);
        writer.SetTagged();

        writer.SetPdfVersion(PdfWriter.PDF_VERSION_1_7);

        document.Open();

        XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, reader);
        document.Close();

        fs.Close();`

```