'宣言 Public MustInherit Class MarkupAnnotation Inherits AnnotationBase Implements GrapeCity.Documents.Common.IOwnedObject, GrapeCity.Documents.Pdf.IDocProvider, GrapeCity.Documents.Pdf.Structure.IContentItem
public abstract class MarkupAnnotation : AnnotationBase, GrapeCity.Documents.Common.IOwnedObject, GrapeCity.Documents.Pdf.IDocProvider, GrapeCity.Documents.Pdf.Structure.IContentItem