''' <summary>
''' Creates a tagged PDF document with marked text clip.
''' </summary>
Public Shared Sub CreateTaggedPdfWithClippedText()
    ' create new PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument()
        ' add new page to the PDF document
        document.Pages.Add(New System.Drawing.SizeF(250, 250))

        ' create marked information object
        Dim markInfo As New Vintasoft.Imaging.Pdf.Tree.PdfMarkInformation(document)
        markInfo.IsMarked = True
        ' add marked information object to the PDF document
        document.MarkedInformation = markInfo

        ' get graphics object associated with page
        Using graphics As Vintasoft.Imaging.Pdf.Drawing.PdfGraphics = document.Pages(0).GetGraphics()
            ' begin the marked content
            graphics.BeginMarkedContent("ClipText")

            ' save the graphics state
            graphics.SaveGraphicsState()
            ' update the clip region
            graphics.IntersectClip(New System.Drawing.RectangleF(0, 50, 100, 100))

            ' get the PDF font
            Dim pdfFont As Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont = document.FontManager.GetStandardFont(Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman)
            ' draw a text string
            graphics.DrawString("Text string", pdfFont, 30, New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green), New System.Drawing.PointF(25, 100))

            ' restore graphics state
            graphics.RestoreGraphicsState()

            ' end the marked content
            graphics.EndMarkedContent()
        End Using

        ' save document
        document.SaveChanges("D:\testTaggedPdf.pdf")
    End Using
End Sub

/// <summary>
/// Creates a tagged PDF document with marked text clip.
/// </summary>
public static void CreateTaggedPdfWithClippedText()
{
    // create new PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument())
    {
        // add new page to the PDF document
        document.Pages.Add(new System.Drawing.SizeF(250, 250));

        // create marked information object
        Vintasoft.Imaging.Pdf.Tree.PdfMarkInformation markInfo =
            new Vintasoft.Imaging.Pdf.Tree.PdfMarkInformation(document);
        markInfo.IsMarked = true;
        // add marked information object to the PDF document
        document.MarkedInformation = markInfo;

        // get graphics object associated with page
        using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics graphics = document.Pages[0].GetGraphics())
        {
            // begin the marked content
            graphics.BeginMarkedContent("ClipText");

            // save the graphics state
            graphics.SaveGraphicsState();
            // update the clip region
            graphics.IntersectClip(new System.Drawing.RectangleF(0, 50, 100, 100));

            // get the PDF font
            Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont pdfFont = document.FontManager.GetStandardFont(
                Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman);
            // draw a text string
            graphics.DrawString(
                "Text string",
                pdfFont,
                30,
                new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green),
                new System.Drawing.PointF(25, 100));

            // restore graphics state
            graphics.RestoreGraphicsState();

            // end the marked content
            graphics.EndMarkedContent();
        }

        // save document
        document.SaveChanges(@"D:\testTaggedPdf.pdf");
    }
}