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                                                        618
          CHAPTER 8                                                                 Interactive Features




                        TABLE 8.21 Additional entries specific to markup annotations
KEY            TYPE             VALUE

T              text string      (Optional; PDF 1.1) The text label to be displayed in the title bar of the annota-
                                tion’s pop-up window when open and active. By convention, this entry identifies
                                the user who added the annotation.

Popup          dictionary       (Optional; PDF 1.3) An indirect reference to a pop-up annotation for entering or
                                editing the text associated with this annotation.

CA             number           (Optional; PDF 1.4) The constant opacity value to be used in painting the anno-
                                tation (see Sections 7.1, “Overview of Transparency,” and 7.2.6, “Shape and
                                Opacity Computations”). This value applies to all visible elements of the annota-
                                tion in its closed state (including its background and border) but not to the pop-
                                up window that appears when the annotation is opened.
                                The specified value is not used if the annotation has an appearance stream (see
                                Section 8.4.4, “Appearance Streams”); in that case, the appearance stream must
                                specify any transparency. (However, if the viewer regenerates the annotation’s
                                appearance stream, it may incorporate the CA value into the stream’s content.)
                                The implicit blend mode (see Section 7.2.4, “Blend Mode”) is Normal. Default
                                value: 1.0.
                                Note: If no explicit appearance stream is defined for the annotation, it is painted by
                                implementation-dependent means that do not necessarily conform to the Adobe
                                imaging model; in this case, the effect of this entry is implementation-dependent as
                                well.

RC             text string or   (Optional; PDF 1.5) A rich text string (see “Rich Text Strings” on page 680) to be
               text stream      displayed in the pop-up window when the annotation is opened.

CreationDate   date             (Optional; PDF 1.5) The date and time (Section 3.8.3, “Dates”) when the annota-
                                tion was created.

IRT            dictionary       (Required if an RT entry is present, otherwise optional; PDF 1.5) A reference to the
                                annotation that this annotation is “in reply to.” Both annotations must be on the
                                same page of the document. The relationship between the two annotations is
                                specified by the RT entry.
                                If this entry is present in an FDF file (see Section 8.6.6, “Forms Data Format”),
                                its type is not a dictionary but a text string containing the contents of the NM en-
                                try of the annotation being replied to, to allow for a situation where the annota-
                                tion being replied to is not in the same FDF file.

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