Represents the "AP" entry of the 3d angular dimension measurement object.

It is a required entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains an array which contains doubles, representing PDF numeric objects.

For definitive details see:.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 9.39d, page 68.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 329, page 689.

The AP entry references the annotation appearance stream for the angular measurement, including the arc and leader lines drawn in the 2D projection.