Known Indirect Subclasses
||ElementBuilder is used to build new PDF.Elements (e.g.
||ElementReader can be used to parse and process content streams.
||ElementWriter can be used to assemble and write new content to a page, Form XObject,
Type3 Glyph stream, pattern stream, or any other content stream.
||An interactive form (sometimes referred to as an AcroForm) is a
collection of fields for gathering information interactively from
||Image2RGB is a filter that can decompress and normalize any PDF image stream
||Image2RGBA is a filter that can decompress and normalize any PDF image stream
||PDFDraw contains methods for converting PDF pages to images and to Bitmap