Handle to a PDF dictionary object, which represents an optional-content membership dictionary object.

Members:

IG_PDF_dictionary_create	Creates a new optional-content membership dictionary object in the given document for the given layers and visibility policy.
IG_PDF_dictionary_get_layer	Gets the layer with the specified index in a membership dictionary.
IG_PDF_dictionary_get_layer_count	Gets the number of layers listed in a membership dictionary.
IG_PDF_dictionary_get_unique_id	Returns some 32-bit integer that is unique for all Dictionary objects.
IG_PDF_dictionary_get_vis_policy	Gets the optional-content membership dictionary's visibility policy.
IG_PDF_dictionary_release	Releases the native object and frees memory.