ColorDetails Describe each SpotColor defined in the document
 PdfAction A PdfAction defines an action that can be triggered
 PdfBlendMode Possible transparency blend modes to be used in a PdfGstate
 PdfBody This class generates the structure of a PDF document.
 PdfGState Graphic state dictionary
 PdfPTable This is a table that can be put at an absolute position but can also be added to the document as the class Table.
 PdfSpotColor A PdfSpotColor defines a ColorSpace
 PdfStructureElement This is a node in a document logical structure.
 PdfViewPreferences Contains the constants used for modify the pdf display preferences