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Defines possible values of ActionSubmitForm#submitFormat property.
FDF: 1;
Field names and values are submitted in Forms Data Format (FDF).
HtmlForm: 0;
Field names and values are submitted in HTML Form format.
PDF: 3;
Document is submitted as PDF, using the MIME content type "application/pdf".
XFDF: 2;
Field names and values are submitted as XFDF.