See: Description
| Class | Description | 
|---|---|
| FieldUtils | A set of utility methods to help with common AcroForm form and field related functions. | 
| PDAcroForm | An interactive form, also known as an AcroForm. | 
| PDButton | A button field represents an interactive control on the screen
 that the user can manipulate with the mouse. | 
| PDCheckBox | A check box toggles between two states, on and off. | 
| PDChoice | A choice field contains several text items, one or more of which shall be selected as the field
 value. | 
| PDComboBox | A combo box consisting of a drop-down list. | 
| PDField | A field in an interactive form. | 
| PDFieldTree | The field tree. | 
| PDListBox | A scrollable list box. | 
| PDNonTerminalField | A non terminal field in an interactive form. | 
| PDPushButton | A pushbutton is a purely interactive control that responds immediately to user
 input without retaining a permanent value. | 
| PDRadioButton | Radio button fields contain a set of related buttons that can each be on or off. | 
| PDSignatureField | A signature field is a form field that contains a digital signature. | 
| PDTerminalField | A field in an interactive form. | 
| PDTextField | A text field is a box or space for text fill-in data typically entered from a keyboard. | 
| PDVariableText | Base class for fields which use "Variable Text". | 
| PDXFAResource | An XML Forms Architecture (XFA) resource. | 
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