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

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 206, page 424.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 210, page 515.

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

A URI action opens a resource identified by a Uniform Resource Identifier. The URI entry holds the URI string, which may be absolute or relative (resolved against the catalog base URI). The IsMap entry supports server-side image maps.