This class represents the opi version dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 368, page 639.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 405, page 823.

System.Object
    WebSupergoo.ABCpdf13.Elements.Element
       WebSupergoo.ABCpdf13.Elements.OpiVersionElement