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Represents the "F" entry of the annotation dictionary
object.
It is an optional entry defined as part of the PDF 1.1
specification.
It contains an integer representing a PDF numeric object.
The PDF specification states that this item assumes a value of 0
if no value has been provided.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 164,
page 383.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 166, page 464.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 252,
page 467.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 255, page 565.
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