This class represents the developer extensions dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 50, page 108.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 49, page 140.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 3.25b, page 25.

The developer extensions dictionary describes a single extension to the PDF specification defined by a third party. It is stored as a named entry in the Extensions dictionary in the document catalog.

The BaseVersion entry names the PDF version on which the extension is based, as a name object such as 1.7 or 2.0. The ExtensionLevel entry is an integer identifying the specific revision of the extension.

A conforming reader that does not understand a developer extension should still be able to process the document to the extent that the base PDF version allows. Extensions must not require a reader to understand them in order to process the document correctly.

The URL entry provides a URI where documentation for the extension can be found. This helps readers and developers identify and understand the extension.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.DeveloperExtensionsElement