Represents the "F" entry of the version 1.3 opi dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a FileSpecificationElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 369, page 639.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 406, page 823.