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                                                147
            SECTION 3.6                                                    Document Structure



KEY              TYPE          VALUE

Dur              number        (Optional; PDF 1.1) The page’s display duration (also called its advance
                               timing): the maximum length of time, in seconds, that the page is dis-
                               played during presentations before the viewer application automatically
                               advances to the next page (see Section 8.3.3, “Presentations”). By default,
                               the viewer does not advance automatically.

Trans            dictionary    (Optional; PDF 1.1) A transition dictionary describing the transition effect
                               to be used when displaying the page during presentations (see Section
                               8.3.3, “Presentations”).

Annots           array         (Optional) An array of annotation dictionaries representing annotations
                               associated with the page (see Section 8.4, “Annotations”).

AA               dictionary    (Optional; PDF 1.2) An additional-actions dictionary defining actions to
                               be performed when the page is opened or closed (see Section 8.5.2, “Trig-
                               ger Events”; see also implementation note 38 in Appendix H).

Metadata         stream        (Optional; PDF 1.4) A metadata stream containing metadata for the page
                               (see Section 10.2.2, “Metadata Streams”).

PieceInfo        dictionary    (Optional; PDF 1.3) A page-piece dictionary associated with the page (see
                               Section 10.4, “Page-Piece Dictionaries”).

StructParents    integer       (Required if the page contains structural content items; PDF 1.3) The inte-
                               ger key of the page’s entry in the structural parent tree (see “Finding Struc-
                               ture Elements from Content Items” on page 868).

ID               byte string   (Optional; PDF 1.3; indirect reference preferred) The digital identifier of
                               the page’s parent Web Capture content set (see Section 10.9.5, “Object At-
                               tributes Related to Web Capture”).

PZ               number        (Optional; PDF 1.3) The page’s preferred zoom (magnification) factor: the
                               factor by which it should be scaled to achieve the natural display magnifi-
                               cation (see Section 10.9.5, “Object Attributes Related to Web Capture”).

SeparationInfo   dictionary    (Optional; PDF 1.3) A separation dictionary containing information need-
                               ed to generate color separations for the page (see Section 10.10.3, “Separa-
                               tion Dictionaries”).

Tabs             name          (Optional; PDF 1.5) A name specifying the tab order to be used for anno-
                               tations on the page. The possible values are R (row order), C (column or-
                               der), and S (structure order). See Section 8.4, “Annotations,” for details.

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