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(Optional; PDF 1.4) The constant opacity value that shall be used in
painting the annotation (see Sections 11.2, “Overview of Transparency,”
and 11.3.7, “Shape and Opacity Computations”). This value shall apply to
all visible elements of the annotation 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 shall not used if the annotation has an appearance
stream (see 12.5.5, “Appearance Streams”); in that case, the appearance
stream shall specify any transparency. (However, if the compliant viewer
regenerates the annotation’s appearance stream, it may incorporate the
CA value into the stream’s content.)
The implicit blend mode (see 11.3.5, “Blend Mode””) is Normal. Default
If no explicit appearance stream is defined for the annotation, it may be
painted by implementation-dependent means that do not necessarily
conform to the PDF imaging model; in this case, the effect of this entry is
implementation-dependent as well.
(Optional; PDF 1.5) A rich text string (see 22.214.171.124, “Rich Text Strings”)
that shall be displayed in the pop-up window when the annotation is
(Optional; PDF 1.5) The date and time (7.9.4, “Dates”) when the
annotation was created.
(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 shall be on the same page of the document. The relationship
between the two annotations shall be specified by the RT entry.
If this entry is present in an FDF file (see 12.7.7, “Forms Data Format”), its
type shall not be a dictionary but a text string containing the contents of
the NM entry of the annotation being replied to, to allow for a situation
where the annotation being replied to is not in the same FDF file.
(Optional; PDF 1.5) Text representing a short description of the subject
being addressed by the annotation.
(Optional; meaningful only if IRT is present; PDF 1.6) A name specifying
the relationship (the “reply type”) between this annotation and one
specified by IRT . Valid values are:
The annotation shall be considered a reply to the annotation
specified by IRT . Conforming readers shall not display replies
to an annotation individually but together in the form of
The annotation shall be grouped with the annotation specified
by IRT ; see the discussion following this Table.
Default value: R.
(Optional; PDF 1.6) A name describing the intent of the markup
annotation. Intents allow conforming readers to distinguish between
different uses and behaviors of a single markup annotation type. If this
entry is not present or its value is the same as the annotation type, the
annotation shall have no explicit intent and should behave in a generic
manner in a conforming reader.
Free text annotations (Table 174), line annotations (Table 175), polygon
annotations (Table 178), and (PDF 1.7) p
olyline annotations (Table 178)
have defined intents, whose values are enumerated in the corresponding
Table 170 – Additional entries specific to markup annotations (continued)