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                                                643
      SECTION 8.4                                                                   Anno ta tions



KEY     TYPE            VALUE

RI      stream          (Optional; pushbutton fields only; must be an indirect reference) A form XObject
                        defining the widget annotation’s rollover icon, displayed when the user rolls the
                        cursor into its active area without pressing the mouse button.

IX      stream          (Optional; pushbutton fields only; must be an indirect reference) A form XObject
                        defining the widget annotation’s alternate (down) icon, displayed when the
                        mouse button is pressed within its active area.

IF      dictionary      (Optional; pushbutton fields only) An icon fit dictionary (see Table 8.97 on page
                        719) specifying how to display the widget annotation’s icon within its annotation
                        rectangle. If present, the icon fit dictionary applies to all of the annotation’s icons
                        (normal, rollover, and alternate).

TP      integer         (Optional; pushbutton fields only) A code indicating where to position the text of
                        the widget annotation’s caption relative to its icon:
                           0    No icon; caption only
                           1    No caption; icon only
                           2    Caption below the icon
                           3    Caption above the icon
                           4    Caption to the right of the icon
                           5    Caption to the left of the icon
                           6    Caption overlaid directly on the icon
                        Default value: 0.


      Printer’s Mark Annotations

      A printer’s mark annotation (PDF 1.4) represents a graphic symbol, such as a
      registration target, color bar, or cut mark, added to a page to assist production
      personnel in identifying components of a multiple-plate job and maintaining
      consistent output during production. See Section 10.10.2, “Printer’s Marks,” for
      further discussion.

      Trap Network Annotations

      A trap network annotation (PDF 1.3) defines the trapping characteristics for a
      page of a PDF document. (Trapping is the process of adding marks to a page
      along color boundaries to avoid unwanted visual artifacts resulting from mis-
      registration of colorants when the page is printed.) A page may have at most one

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