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                                                    641
          SECTION 8.4                                                                  Anno ta tions



          annotation dictionary entries specific to this type of annotation; interactive forms
          and fields are discussed at length in Section 8.6.

                      TABLE 8.39 Additional entries specific to a widget annotation
KEY         TYPE             VALUE

Subtype     name             (Required) The type of annotation that this dictionary describes; must be Widget
                             for a widget annotation.

H           name             (Optional) The annotation’s highlighting mode, the visual effect to be used when
                             the mouse button is pressed or held down inside its active area:
                                N    (None) No highlighting.
                                I    (Invert) Invert the contents of the annotation rectangle.
                                O    (Outline) Invert the annotation’s border.
                                P    (Push) Display the annotation’s down appearance, if any (see Section
                                     8.4.4, “Appearance Streams”). If no down appearance is defined, offset
                                     the contents of the annotation rectangle to appear as if it were being
                                     pushed below the surface of the page.
                                T    (Toggle) Same as P (which is preferred).
                             A highlighting mode other than P overrides any down appearance defined for
                             the annotation. Default value: I.

MK          dictionary       (Optional) An appearance characteristics dictionary (see Table 8.40) to be used
                             in constructing a dynamic appearance stream specifying the annotation’s visual
                             presentation on the page.
                             The name MK for this entry is of historical significance only and has no direct
                             meaning.

A           dictionary       (Optional; PDF 1.1) An action to be performed when the annotation is activated
                             (see Section 8.5, “Actions”).

AA          dictionary       (Optional; PDF 1.2) An additional-actions dictionary defining the annotation’s
                             behavior in response to various trigger events (see Section 8.5.2, “Trigger
                             Events”).

BS          dictionary       (Optional; PDF 1.2) A border style dictionary (see Table 8.17 on page 611) speci-
                             fying the width and dash pattern to be used in drawing the annotation’s border.
                             Note: The annotation dictionary’s AP entry, if present, takes precedence over the L
                             and BS entries; see Table 8.15 on page 606 and Section 8.4.4, “Appearance Streams.”

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