2.1.36 [ISO32000-1] Section 12.7.7, Forms Data Format
V0036:
The specification states:
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This sub-clause describes Forms Data Format (FDF), the file format used for interactive form data (PDF 1.2). FDF can be used when submitting form data to a server, receiving the response, and incorporating it into the interactive form.
Microsoft Edge:
Forms data format is not supported.