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    CHAPTER 8                                                          Interactive Features



8.4 Annotations

    An annotation associates an object such as a note, sound, or movie with a location
    on a page of a PDF document, or provides a way to interact with the user by
    means of the mouse and keyboard. PDF includes a wide variety of standard an-
    notation types, described in detail in Section 8.4.5, “Annotation Types.”

    Many of the standard annotation types may be displayed in either the open or the
    closed state. When closed, they appear on the page in some distinctive form, such
    as an icon, a box, or a rubber stamp, depending on the specific annotation type.
    When the user activates the annotation by clicking it, it exhibits its associated ob-
    ject, such as by opening a pop-up window displaying a text note (Figure 8.2) or by
    playing a sound or a movie.



                W E HAVE BEEN TRACKING GREAT EMPLOYEES SINCE 1981,
                when we began research on our book The 100 Best
                Companies to Work for in America. From our database of
                                                 Comment
                more than 1,000 companies, we selected 238 as the most
                                   This is the text this group, 161 agreed to
                viable candidates for this list. Ofassociated with the
                participate. (To behighlight annotation. must be at least ten
                                    eligible, a company
                years old and have a minimum of 500 employees.)
                    We asked each candidate company to distribute to 225
                randomly selected employees the Great Place to Work
                Trust Index. This employee survey was designed by the
                Great Place to Work Institute of San Francisco to evaluate
                trust in management, pride in work/company, and
                camaraderie. Responses were returned directly to us.
                     Each company was also required to fill out the Hewitt
                People Practices Inventory, a comprehensive 29-page
                questionnaire designed by our partner in this project,
                Hewitt Associates of Lincolnshire, Ill., a leading
                management consulting firm. Finally we asked each of our
                candidates to send us additional corporate materials, such


                                FIGURE 8.2 Open annotation


    Viewer applications may permit the user to navigate through the annotations on
    a page by using the keyboard (in particular, the tab key); see implementation note
    77 in Appendix H. Beginning with PDF 1.5, PDF producers may make the navi-

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