This class represents the url alias dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 356, page 624.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 392, page 804.

A URL alias dictionary records the relationship between the originally requested URL and the final URL that served the content after any redirects during web capture.

The U entry holds the final URL. The C entry holds an array of indirect references to the web capture content sets retrieved from that URL.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.UrlAliasElement