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# Index

## Classes

| Name | Description
--- | --- | ---
| PDFOptionalContentBase | Defines the base class for optional content groups and sets.
| PDFOptionalContentDisplayTree | Defines the hierarchy of optional content groups that is displayed in the user interface by the viewer applications.
| PDFOptionalContentDisplayTreeNode | Defines a node in the optional content display tree.
| PDFOptionalContentDisplayTreeNodeCollection | Defines a collection of nodes in the optional content display tree.
| PDFOptionalContentGroup | Represents an optional content group.
| PDFOptionalContentGroupCollection | Defines a collection of optional content groups.
| PDFOptionalContentProperties | Defines the properties for optional content in the PDF document.
| PDFOptionalContentSet | Defines an optional content membership dictionary.

## Enums

| Name | Description
--- | --- | ---
| PDFOptionalContentGroupDefaultState | The possible default states for optional content.
| PDFOptionalContentGroupExportState | Possible export states for an optional content group.
| PDFOptionalContentGroupPrintState | Possible print states for an optional content group.
| PDFOptionalContentGroupVisibilityState | Possible visibility states for an optional content group.
| PDFOptionalContentVisibilityPolicy | Specifies the supported visibility policies for optional content groups that are part of an PDFOptionalContentSet.