Represents the "AF" entry of the annotation dictionary object.

It is an optional entry defined as part of the PDF 2.0 specification.

It contains an array which contains FileSpecificationElements.

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 466.

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.

The associated files array links one or more file specifications to this annotation. In PDF/A-3 associated files carry the machine-readable data corresponding to the human-readable annotation content.