C# で HTML を XML に変換する

using (Presentation pres = new Presentation())
    {
        pres.Slides.AddFromHtml("page.html");
        pres.Slides.RemoveAt(0); // removes default empty slide

        for (var index = 0; index < pres.Slides.Count; index++)
        {
            ISlide slide = pres.Slides[index];
            using (FileStream stream = new FileStream($"doc-{index}.xml", FileMode.Create, FileAccess.Write))
            {
                slide.WriteAsSvg(stream);
            }
        }
    }