Represents the "AF" entry of the dpart 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 32000-2:2017 PDF 2.0; Table: 409, page 830.

The AF entry holds an array of file specification dictionaries for associated files linked to this document part, independently of document-level or page-level associated files.