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# Namespace pdftron.FDF

### Classes

#### FDFDoc

FDFDoc is a class representing Forms Data Format (FDF) documents. FDF is typically used when submitting form data to a server, receiving the response, and incorporating it into the interactive form. It can also be used to export form data to stand-alone files that can be stored, transmitted electronically, and imported back into the corresponding PDF interactive form. In addition, beginning in PDF 1.3, FDF can be used to define a container for annotations that are separate from the PDF document to which they apply.

#### FDFField

#### FDFFieldIterator

FDFFieldIterator is an iterator type used to traverse interactive form fields in a FDF document. A FDFFieldIterator points to FDF.FDFField nodes or to the `null` FDFField node.

#### XFDFExportOptions