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.

The OPI version dictionary holds separate OPI dictionaries for version 1.3 and version 2.0. A single image XObject may carry both to support processors implementing either version.

The 1.3 entry references a version 1.3 OPI dictionary. The 2.0 entry references a version 2.0 OPI dictionary. An OPI processor uses whichever version it supports, preferring 2.0 when both are present.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.OpiVersionElement