Creating a tagged PDF document from scratch

//We assume that GdPicture has been correctly installed and unlocked.
using (GdPicturePDF oGdPicturePDF = new GdPicturePDF())
{
    //Creating a new PDF document.
    if ((oGdPicturePDF.NewPDF(PdfConformance.PDF_UA_1) == GdPictureStatus.OK) &&
        (oGdPicturePDF.NewPage(PdfPageSizes.PdfPageSizeA4) == GdPictureStatus.OK))
    {
        //This is required to have a valid PDF_UA document.
        oGdPicturePDF.SetTitle("My first PDF/UA document");
        // Add the font for drawing a text.
        string fontResName = oGdPicturePDF.AddTrueTypeFontU("Arial", false, false, true);
        oGdPicturePDF.SetTextSize(18);
        //Adding the first image to the PDF document.
        string logo1 = oGdPicturePDF.AddJpegImageFromFile("brand1.jpg");
        if (oGdPicturePDF.GetStat() == GdPictureStatus.OK)
        {
            //Adding the second image to the PDF document.
            string logo2 = oGdPicturePDF.AddJpegImageFromFile("brand2.jpg");
            if (oGdPicturePDF.GetStat() == GdPictureStatus.OK)
            {
                //Creating a root tag and set the language.
                int tagRootID = oGdPicturePDF.GetTagRootID();
                if ((oGdPicturePDF.GetStat() != GdPictureStatus.OK) ||
                    (oGdPicturePDF.SetLanguage("en-US") != GdPictureStatus.OK))
                    goto error;
                //Creating a section tag for the document content.
                int tagSection = oGdPicturePDF.NewTag(tagRootID, "Sect");
                if (oGdPicturePDF.GetStat() != GdPictureStatus.OK) goto error;
                //Creating a tag for the text of the sentence.
                if ((oGdPicturePDF.BeginMarkedContentSequence(tagSection, "Span") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.DrawText(fontResName, 20, 750, "The product") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.EndMarkedContent() != GdPictureStatus.OK))
                    goto error;
                //Creating a tag and setting its properties for the first image.
                int tagLogo1 = oGdPicturePDF.NewTag(tagSection, "Figure");
                if (oGdPicturePDF.GetStat() != GdPictureStatus.OK) goto error;
                if ((oGdPicturePDF.SetTagAlternateDescription(tagLogo1, "This is a logo of brand1.") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.SetTagAttribute(tagLogo1, "BBox", new double[] { 125, 750, 221.75, 771.75 }) != GdPictureStatus.OK))
                    goto error;
                //Creating a tag for the image itself and drawing the image.
                if ((oGdPicturePDF.BeginMarkedContentSequence(tagLogo1, "Figure") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.DrawImage(logo1, 125, 750, 96.75f, 21.75f) != GdPictureStatus.OK) ||
                    (oGdPicturePDF.EndMarkedContent() != GdPictureStatus.OK))
                    goto error;
                //Creating a tag for the text of the sentence.
                if ((oGdPicturePDF.BeginMarkedContentSequence(tagSection, "Span") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.DrawText(fontResName, 230, 750, "is powered by") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.EndMarkedContent() != GdPictureStatus.OK))
                    goto error;
                //Creating a tag and setting its properties for the second image.
                int tagLogo2 = oGdPicturePDF.NewTag(tagSection, "Figure");
                if (oGdPicturePDF.GetStat() != GdPictureStatus.OK) goto error;
                if ((oGdPicturePDF.SetTagAlternateDescription(tagLogo2, "This is a logo of brand2.") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.SetTagAttribute(tagLogo2, "BBox", new double[] { 350, 750, 446.75, 771.75 }) != GdPictureStatus.OK))
                    goto error;
                //Creating a tag for the image itself and drawing the image.
                if ((oGdPicturePDF.BeginMarkedContentSequence(tagLogo2, "Figure") != GdPictureStatus.OK) ||
                    (oGdPicturePDF.DrawImage(logo2, 350, 750, 96.75f, 21.75f) != GdPictureStatus.OK) ||
                    (oGdPicturePDF.EndMarkedContent() != GdPictureStatus.OK))
                    goto error;
                error:
                if (oGdPicturePDF.GetStat() == GdPictureStatus.OK)
                {
                    //Saving the created document.
                    if (oGdPicturePDF.SaveToFile("tagged_document.pdf") == GdPictureStatus.OK)
                        MessageBox.Show("Your tagged PDF document has been successfully created.", "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    else
                        MessageBox.Show("The error occured when saving. Error: " + oGdPicturePDF.GetStat().ToString(), "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                    MessageBox.Show("The error occured when creating tags. Error: " + oGdPicturePDF.GetStat().ToString(), "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
                MessageBox.Show("The error occured when adding the second image. Error: " + oGdPicturePDF.GetStat().ToString(), "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        else
            MessageBox.Show("The error occured when adding the first image. Error: " + oGdPicturePDF.GetStat().ToString(), "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
        oGdPicturePDF.CloseDocument();
    }
    else
        MessageBox.Show("The new document can't be created. Error: " + oGdPicturePDF.GetStat().ToString(), "Creating a Tagged PDF Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
}