Represents the "OCGs" entry of the usage application dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains an array which contains OptionalContentGroupElements.

For definitive details see:.

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.

The OCGs array lists the optional content groups that are candidates for automatic state setting when the named event occurs. Only groups in this list are consulted; other groups are unaffected by this usage application entry.