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       SECTION 8.3                                                             Page-Level Navigation




                                 TABLE 8.12 Entries in a bead dictionary
KEY    TYPE             VALUE

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

T      dictionary       (Required for the first bead of a thread; optional for all others; must be an indirect refer-
                        ence) The thread to which this bead belongs.
                        Note: In PDF 1.1, this entry is permitted only for the first bead of a thread. In PDF 1.2
                        and higher, it is permitted for any bead but required only for the first.

N      dictionary       (Required; must be an indirect reference) The next bead in the thread. In the last bead,
                        this entry points to the first.

V      dictionary       (Required; must be an indirect reference) The previous bead in the thread. In the first
                        bead, this entry points to the last.

P      dictionary       (Required; must be an indirect reference) The page object representing the page on
                        which this bead appears.

R      rectangle        (Required) A rectangle specifying the location of this bead on the page.

       Example 8.6 shows a thread with three beads.

       Example 8.6

          22 0 obj
             << /F 23 0 R
                 /I << /Title ( Man Bites Dog ) >>
             >>
          endobj

          23 0 obj
             << /T    22 0 R
                 /N   24 0 R
                 /V   25 0 R
                 /P   80R
                 /R   [ 158 247 318 905 ]
             >>
          endobj

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