This class represents the transition action. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 215, page 429.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 219, page 521.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.ActionElement
          WebSupergoo.ABCpdf14.Elements.TransitionActionElement

A transition action triggers a page transition effect directly, independent of a page change. The Trans entry holds a complete transition dictionary describing the style, direction, and duration.