One entry of an appearance dictionary: a single appearance stream, or a subdictionary of streams keyed by appearance state.
public sealed class PdfAppearanceEntry
ISO 32000-2 §12.5.5, Table 170: "Each entry ... shall contain either a single appearance stream or an appearance subdictionary",
whose keys are state names such as On and Off. A state value that is not a stream is skipped with a diagnostic.
kind:method, kind:property, kind:ctor. Press Esc to clear.FormGets the single appearance stream, or null when the entry is a state subdictionary.HasStatesGets a value indicating whether the entry is a subdictionary of appearance states rather than one stream.StateNamesGets the names of the appearance states whose value is a stream, in the subdictionary's order; empty for a single stream.ValueGets the entry as stored: a stream, a dictionary, or a reference to one.GetAppearance(CosName)Returns the appearance stream of the state state.