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          SECTION 8.2                                                     Document-Level Navigation



          order). Table 8.5 shows the meanings of the flags; all undefined flag bits are
          reserved and must be set to 0.

                                           TABLE 8.5 Outline item flags
BIT POSITION       NAME          MEANING

1                  Italic        If set, display the item in italic.

2                  Bold          If set, display the item in bold.

          Example 8.1 shows a typical outline dictionary and outline item dictionary. See
          Appendix G for an example of a complete outline hierarchy.

          Example 8.1

               21 0 obj
                  << /Count 6
                      /First 22 0 R
                      /Last 29 0 R
                  >>
               endobj

               22 0 obj
                  << /Title ( Chapter 1 )
                      /Parent 21 0 R
                      /Next 26 0 R
                      /First 23 0 R
                      /Last 25 0 R
                      /Count 3
                      /Dest [ 3 0 R /XYZ 0 792 0 ]
                  >>
               endobj


    8.2.3 Thumbnail Images

          A PDF document can define thumbnail images representing the contents of its
          pages in miniature form. A viewer application can display these images on the
          screen, allowing the user to navigate to a page by clicking its thumbnail image:

          Note: Thumbnail images are not required, and may be included for some pages and
          not for others.

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