This class represents the rich-media-execute action. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 222, page 523.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.48a, page 40.

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

A rich media execute action sends a command to a rich media instance embedded in an annotation. The TA entry references the target rich media annotation. TI references the specific instance. CMD holds the rich media command dictionary.