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                                                  586
        CHAPTER 8                                                             Interactive Features



KEY        TYPE               VALUE

Prev       dictionary         (Required for all but the first item at each level; must be an indirect reference)
                              The previous item at this outline level.

Next       dictionary         (Required for all but the last item at each level; must be an indirect reference)
                              The next item at this outline level.

First      dictionary         (Required if the item has any descendants; must be an indirect reference) The
                              first of this item’s immediate children in the outline hierarchy.

Last       dictionary         (Required if the item has any descendants; must be an indirect reference) The
                              last of this item’s immediate children in the outline hierarchy.

Count      integer            (Required if the item has any descendants) If the item is open, the total num-
                              ber of its open descendants at all lower levels of the outline hierarchy. If the
                              item is closed, a negative integer whose absolute value specifies how many
                              descendants would appear if the item were reopened.

Dest       name,              (Optional; not permitted if an A entry is present) The destination to be dis-
           byte string, or    played when this item is activated (see Section 8.2.1, “Destinations”; see also
           array              implementation note 75 in Appendix H).

A          dictionary         (Optional; PDF 1.1; not permitted if a Dest entry is present) The action to be
                              performed when this item is activated (see Section 8.5, “Actions”).

SE         dictionary         (Optional; PDF 1.3; must be an indirect reference) The structure element to
                              which the item refers (see Section 10.6.1, “Structure Hierarchy”).
                              Note: The ability to associate an outline item with a structure element (such as
                              the beginning of a chapter) is a PDF 1.3 feature. For backward compatibility
                              with earlier PDF versions, such an item should also specify a destination (Dest)
                              corresponding to an area of a page where the contents of the designated struc-
                              ture element are displayed.

C          array              (Optional; PDF 1.4) An array of three numbers in the range 0.0 to 1.0, repre-
                              senting the components in the DeviceRGB color space of the color to be used
                              for the outline entry’s text. Default value: [ 0.0 0.0 0.0 ].

F          integer            (Optional; PDF 1.4) A set of flags specifying style characteristics for display-
                              ing the outline item’s text (see Table 8.5). Default value: 0.

        The value of the outline item dictionary’s F entry (PDF 1.4) is an unsigned 32-bit
        integer containing flags specifying style characteristics for displaying the item. Bit
        positions within the flag word are numbered from 1 (low-order) to 32 (high-

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