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                                                   615
           SECTION 8.4                                                            Anno ta tions



           havior (such as displaying nothing) if an annotation’s AS entry designates an ap-
           pearance state for which no appearance is defined in the appearance dictionary.

           For convenience in managing appearance streams that are used repeatedly, the AP
           entry in a PDF document’s name dictionary (see Section 3.6.3, “Name Diction-
           ary”) can contain a name tree mapping name strings to appearance streams. The
           name strings have no standard meanings; no PDF objects refer to appearance
           streams by name.


  8.4.5 Annotation Types

           PDF supports the standard annotation types listed in Table 8.20. The following
           sections describe each of these types in detail. Plug-in extensions may add new
           annotation types, and further standard types may be added in the future. (See im-
           plementation note 88 in Appendix H.)

           The values in the first column of Table 8.20 represent the value of the annotation
           dictionary’s Subtype entry. The third column indicates whether the annotation is
           a markup annotation, as described in “Markup Annotations,” below. The section
           also provides more information about the value of the Contents entry for differ-
           ent annotation types.

                                      TABLE 8.20 Annotation types
ANNOTATION TYPE DESCRIPTION                        MARKUP? DISCUSSED IN SECTION

Text              Text annotation                  Yes      “Text Annotations” on page 621

Link              Link annotation                  No       “Link Annotations” on page 622

FreeText          (PDF 1.3) Free text annotation   Yes      “Free Text Annotations” on page 623

Line              (PDF 1.3) Line annotation        Yes      “Line Annotations” on page 626

Square            (PDF 1.3) Square annotation      Yes      “Square and Circle Annotations” on page 630

Circle            (PDF 1.3) Circle annotation      Yes      “Square and Circle Annotations” on page 630

Polygon           (PDF 1.5) Polygon annotation     Yes      “Polygon and Polyline Annotations” on page
                                                            632

PolyLine          (PDF 1.5) Polyline annotation    Yes      “Polygon and Polyline Annotations” on page
                                                            632

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