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       APPENDIX F                                                                Linearized PDF



       A single entry in the shared object hint table can actually describe a group of ad-
       jacent objects under the following condition: Only the first object in the group is
       referenced from outside the group; the remaining objects in the group are refer-
       enced only from other objects in the same group. The objects in a group must
       have adjacent object numbers.

       The page offset hint table, interactive form hint table, and logical structure hint
       table refer to an entry in the shared object hint table by a simple index that is its
       sequential position in the table, counting from 0.

       The shared object hint table consists of a header section (Table F.5) followed by
       one or more shared object group entries (Table F.6). There are two sequences of
       shared object group entries: the ones for objects located in the first page, followed
       by the ones for objects located in the shared objects section. The entries have the
       same format in both cases. Note that the items making up each shared object
       group entry are not contiguous; they are broken up with items from entries for
       other shared object groups. The order of items in each sequence is as follows:

       1. Item 1 for the first group, item 1 for the second group, and so on
       2. Item 2 for the first group, item 2 for the second group, and so on
       3. Item 3 for the first group, item 3 for the second group, and so on
       4. Item 4 for the first group, item 4 for the second group, and so on

       All objects associated with the first page (part 6) have entries in the shared object
       hint table, regardless of whether they are actually shared. The first entry refers to
       the beginning of the first page and has an object count and length that span all
       the initial nonshared objects. The next entry refers to a group of shared objects.
       Subsequent entries span additional groups of either shared or nonshared objects
       consecutively until all shared objects in the first page have been enumerated.
       (The entries that refer to nonshared objects are never used.)

                         TABLE F.5 Shared object hint table, header section
ITEM       SIZE (BITS)       DESCRIPTION

1          32                The object number of the first object in the shared objects section (part 8).

2          32                The location of the first object in the shared objects section.

3          32                The number of shared object entries for the first page (including nonshared
                             objects, as noted above).

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