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           CHAPTER 8                                                             Interactive Features




                          TABLE 8.15 Entries common to all annotation dictionaries
KEY           TYPE              VALUE

Type          name              (Optional) The type of PDF object that this dictionary describes; if present,
                                must be Annot for an annotation dictionary.

Subtype       name              (Required) The type of annotation that this dictionary describes; see Table 8.20
                                on page 615 for specific values.

Rect          rectangle         (Required) The annotation rectangle, defining the location of the annotation on
                                the page in default user space units.

Contents      text string       (Optional) Text to be displayed for the annotation or, if this type of annotation
                                does not display text, an alternate description of the annotation’s contents in
                                human-readable form. In either case, this text is useful when extracting the
                                document’s contents in support of accessibility to users with disabilities or for
                                other purposes (see Section 10.8.2, “Alternate Descriptions”). See Section 8.4.5,
                                “Annotation Types” for more details on the meaning of this entry for each an-
                                notation type.

P             dictionary        (Optional; PDF 1.3; not used in FDF files) An indirect reference to the page ob-
                                ject with which this annotation is associated.
                                Note: This entry is required for screen annotations associated with rendition ac-
                                tions (PDF 1.5; see “Screen Annotations” on page 639 and “Rendition Actions” on
                                page 668).

NM            text string       (Optional; PDF 1.4) The annotation name, a text string uniquely identifying it
                                among all the annotations on its page.

M             date or           (Optional; PDF 1.1) The date and time when the annotation was most recently
              text string       modified. The preferred format is a date string as described in Section 3.8.3,
                                “Dates,” but viewer applications should be prepared to accept and display a
                                string in any format. (See implementation note 78 in Appendix H.)

F             integer           (Optional; PDF 1.1) A set of flags specifying various characteristics of the anno-
                                tation (see Section 8.4.2, “Annotation Flags”). Default value: 0.

AP            dictionary        (Optional; PDF 1.2) An appearance dictionary specifying how the annotation is
                                presented visually on the page (see Section 8.4.4, “Appearance Streams” and
                                also implementation note 79 in Appendix H). Individual annotation handlers
                                may ignore this entry and provide their own appearances.

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