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          CHAPTER 8                                                            Interactive Features




                          TABLE 8.92 Entries in the FDF catalog dictionary
KEY               TYPE                  VALUE

Version           name                  (Optional; PDF 1.4) The version of the PDF specification to which
                                        this FDF file conforms (for example, 1.4) if later than the version
                                        specified in the file’s header (see “FDF Header” on page 712). If the
                                        header specifies a later version, or if this entry is absent, the docu-
                                        ment conforms to the version specified in the header.
                                        Note: The value of this entry is a name object, not a number, and
                                        therefore must be preceded by a slash character (/) when written in
                                        the FDF file (for example, /1.4).

FDF               dictionary            (Required) The FDF dictionary for this file (see Table 8.93).

Sig               dictionary            (Optional; PDF 1.5) A signature dictionary indicating that the doc-
                                        ument is signed using an object digest (see Section 8.7, “Digital Sig-
                                        natures”). This dictionary must contain a signature reference
                                        dictionary whose Data entry is an indirect reference to the catalog
                                        and whose TransformMethod entry is Identity.




                               TABLE 8.93 Entries in the FDF dictionary
KEY               TYPE                  VALUE

F                 file specification    (Optional) The source file or target file: the PDF document file that
                                        this FDF file was exported from or is intended to be imported into.

ID                array                 (Optional) An array of two byte strings constituting a file identifier
                                        (see Section 10.3, “File Identifiers”) for the source or target file des-
                                        ignated by F, taken from the ID entry in the file’s trailer dictionary
                                        (see Section 3.4.4, “File Trailer”).

Fields            array                 (Optional) An array of FDF field dictionaries (see “FDF Fields” on
                                        page 717) describing the root fields (those with no ancestors in the
                                        field hierarchy) to be exported or imported. This entry and the
                                        Pages entry may not both be present.

Status            PDFDocEncoded         (Optional) A status string to be displayed indicating the result of an
                  string                action, typically a submit-form action (see “Submit-Form Actions”
                                        on page 703). The string is encoded with PDFDocEncoding. (See
                                        implementation note 128 in Appendix H.) This entry and the Pages
                                        entry may not both be present.

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