The interface generalizing the layer types (PdfLayer, PdfLayerMembership).
An optional content group is a dictionary representing a collection of graphics that can be made visible or invisible dynamically by users of viewer applications.
Content typically belongs to a single optional content group, and is visible when the group is ON and invisible when it is OFF.
This class represents /OCProperties entry if pdf catalog and manages the layers of the pdf document.
An array specifying a visibility expression, used to compute visibility of content based on a set of optional content groups.
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