This class represents the page object additional-actions dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 195, page 416.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 198, page 505.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.PageObjectAdditionalActionsElement

A page object additional-actions dictionary associates actions with page-open and page-close events. The O (open) action fires when the page becomes current; the C (close) action fires when the viewer navigates away.