System.Object
   System.Collections.ObjectModel.ReadOnlyCollection<T>
      Xfinium.Pdf.Content.PdfPathItemCollection
      Xfinium.Pdf.Content.PdfTextFragmentCollection
      Xfinium.Pdf.Content.PdfTextGlyphCollection
      Xfinium.Pdf.Content.PdfTextSearchResultCollection
      Xfinium.Pdf.Content.PdfTextWordCollection
      Xfinium.Pdf.Content.PdfVisualImageCollection
      Xfinium.Pdf.Content.PdfVisualObjectCollection
   Xfinium.Pdf.Content.PdfBatesNumber
   Xfinium.Pdf.Content.PdfBatesNumberAppearance
   Xfinium.Pdf.Content.PdfBatesNumberProvider
   Xfinium.Pdf.Content.PdfContentExtractionContext
   Xfinium.Pdf.Content.PdfContentExtractor
   Xfinium.Pdf.Content.PdfPathItem
   Xfinium.Pdf.Content.PdfTextExtractionOptions
   Xfinium.Pdf.Content.PdfTextFragment
   Xfinium.Pdf.Content.PdfTextGlyph
   Xfinium.Pdf.Content.PdfTextSearchResult
   Xfinium.Pdf.Content.PdfTextWord
   Xfinium.Pdf.Content.PdfVisualImage
   Xfinium.Pdf.Content.PdfVisualObject
      Xfinium.Pdf.Content.PdfFormXObjectVisualObject
      Xfinium.Pdf.Content.PdfImageVisualObject
      Xfinium.Pdf.Content.PdfPathVisualObject
      Xfinium.Pdf.Content.PdfShadingVisualObject
      Xfinium.Pdf.Content.PdfTextVisualObject
   Xfinium.Pdf.Content.PdfVisualObjectGraphicsState
   Xfinium.Pdf.PdfContentStreamContainer
      Xfinium.Pdf.Graphics.PdfFormXObject
         Xfinium.Pdf.Graphics.PdfPageContent
            Xfinium.Pdf.Content.PdfPageOptionalContent

Reference

XFINIUM.PDF Library