2.0 http://www.w3.org/2005/Atom Aspose API References – AppearanceDictionary https://reference.aspose.com/pdf/net/aspose.pdf.annotations/appearancedictionary/ Recent content in AppearanceDictionary......dictionary is synchronized (thread safe). highlight 0 chroma language-csharp...Description key String Key to search in the dictionary. return-value...