Represents the "Window" entry of the 3d activation dictionary object.

It is an optional entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains a RichMediaWindowElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 299, page 514.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 9.34, page 56.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 310, page 643.