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          SECTION 8.2                                                  Document-Level Navigation




                             TABLE 8.8 Entries in a collection field dictionary
KEY                TYPE            VALUE

Type               name            (Optional) The type of PDF object that this dictionary describes; if present,
                                   must be CollectionField for a collection field dictionary.

Subtype            name            (Required) The subtype of collection field or file-related field that this dic-
                                   tionary describes. This entry identifies the type of data that is stored in the
                                   field.
                                   The following values identify the types of fields in the collection item or
                                   collection subitem dictionary:
                                      S    A text field. The field data is stored as a PDF text string.
                                      D    A date field. The field data is stored as a PDF date string.
                                      N    A number field. The field data is stored as a PDF number.
                                   The following values identify the types of file-related fields:
                                      F    The field data is the file name of the embedded file stream, as iden-
                                           tified by the UF entry of the file specification, if present; otherwise
                                           by the F entry of the file specification (see Table 3.41).
                                      Desc The field data is the description of the embedded file stream, as
                                          identified by the Desc entry in the file specification dictionary (see
                                           Table 3.41).
                                      ModDate The field data is the modification date of the embedded file
                                         stream, as identified by the ModDate entry in the embedded file
                                           parameter dictionary (see Table 3.43).
                                      CreationDate The field data is the creation date of the embedded file
                                          stream, as identified by the CreationDate entry in the embedded
                                           file parameter dictionary (see Table 3.43).
                                      Size The field data is the size of the embedded file, as identified by the
                                           Size entry in the embedded file parameter dictionary (see Table
                                           3.43).

N                  text string     (Required) The textual field name that is displayed to the user by the PDF
                                   viewer application.

O                  integer         (Optional) The relative order of the field name in the user interface. Fields
                                   are sorted by the PDF viewer application in ascending order.

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