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                                               601
    SECTION 8.3                                                    Page-Level Navigation



    sition duration specified for a page (page 2 in the figure) governs the transition to
    that page from another page; the transition from the page is governed by the next
    page’s transition duration.


        Transition from                                               Transition from
        page 1 to page 2                Page 2 displayed              page 2 to page 3

. . .                                                                                       . . .
        Transition duration         Display duration for page 2       Transition duration
            for page 2                                                    for page 3



                               FIGURE 8.1 Presentation timing

    Example 8.7 shows the presentation parameters for a page to be displayed for 5
    seconds. Before the page is displayed, there is a 3.5-second transition in which
    two vertical lines sweep outward from the center to the edges of the page.

    Example 8.7

        10 0 obj
           << /Type /Page
               /Parent 4 0 R
               /Contents 16 0 R
               /Dur 5
               /Trans << /Type /Trans
                           /D 3.5
                           /S /Split
                           /Dm /V
                           /M /O
                      >>
           >>
        endobj


    Sub-page Navigation

    Sub-page navigation (PDF 1.5) allows navigating not only between pages but also
    between different states of the same page. For example, a single page in a PDF
    presentation could have a series of bullet points that could be individually turned
    on and off. In such an example, the bullets would be represented by optional con-
    tent (see Section 4.10, “Optional Content”), and each state of the page would be
    represented as a navigation node.

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