| EPdfAcroFormType | 
 Enumeration with the different types of AcroForm fields. 
 | 
| ETextFormatFlag | 
 Enumeration with the possible flags for different text formatting styles. 
 | 
| IAcroChoiceOption | 
 | 
| IPdfAcroField | 
 A form field of a PDF AcroForm. 
 | 
| IPdfAcroField.Checkable | 
 A selectable option, either a check box or a radio button. 
 | 
| IPdfAcroField.Choice | 
 An AcroForm form field for selecting values from a list of options. 
 | 
| IPdfDocument | 
 Represents a PDF document with pages. 
 | 
| IPdfFormVisitor | 
 | 
| IPdfImage | 
 Represents an image included in the PDF, which could e.g. 
 | 
| IPdfLine | 
Represents a plain text line, cConsisting of multiple  words.  
 | 
| IPdfPage | 
 A page of the the PDF. 
 | 
| IPdfText | 
 Represents a piece of plain text in the image, used e.g. 
 | 
| IPdfWord | 
Represents a plain text word, consising of multiple  IPdfText.  
 | 
| UnsupportedXfaFormException | 
 WHen attempting to read a PDF document that contains an XFA form, but XFA forms are not supported by the engine. 
 |