Represents the "Annotation" entry of the movie action object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a MovieAnnotationElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 209, page 425.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 213, page 517.

The annotation entry holds an indirect reference to the movie annotation whose playback is to be controlled. Either Annotation or T must be present.