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                                              1080
      APPENDIX G                                                         Example PDF Files



      The Prev entry in the trailer has again been updated so that it points to the cross-
      reference section added at the previous stage, and the startxref value points to the
      newly added cross-reference section.


G.6.4 Stage 4: Add Three Annotations

      Finally, three new text annotations are added to the file. Table G.6 lists the objects
      involved in this update.

                   TABLE G.6 Object usage after adding three text annotations
      OBJECT IDENTIFIER        OBJECT TYPE

      7 0                      Annotation array

      8 1                      Annot (annotation dictionary)

      9 1                      Annot (annotation dictionary)

      12 0                     Annot (annotation dictionary)


      Object numbers 8 and 9, which were used for the two annotations deleted in the
      previous stage, have been reused; however, the new objects have been given a
      generation number of 1. In addition, the third text annotation added has been
      assigned the previously unused object identifier of 12 0.

      Example G.10 shows the lines added to the file by this update. The added cross-
      reference section contains five entries, corresponding to object number 0, the
      Annots array, and the three annotations added. The entry for object number 0 is
      updated because the previously free entries for object numbers 8 and 9 have been
      reused. The entry for object number 0 now shows that the cross-reference table
      has no free entries. The Annots array is updated to reflect the addition of the
      three text annotations.

      Example G.10
         7 0 obj
            [ 10 0 R
              11 0 R
              81R
              91R
              12 0 R
            ]
         endobj

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