This class represents the usage application dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 103, page 233.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 101, page 286.

A usage application dictionary specifies how usage metadata in optional content groups should be applied automatically in response to a particular event.

The Event entry names the trigger: View for interactive display, Print for printing, or Export for conversion to another format. When the named event occurs, a conforming processor may use the usage data in the listed groups to set their states.

The OCGs entry lists the optional content groups to which this automatic state-setting applies. Only groups in this list are candidates for usage-based state changes for the named event.

The Category entry lists the usage dictionary keys that are relevant for this application. For example, a print application might list Zoom and Print, meaning only those usage sub-dictionaries are consulted when setting states for printing.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.UsageApplicationElement