2.0 http://www.w3.org/2005/Atom Documentation – How to add Underline Annotation using C++https://products.aspose.com/pdf/Cpp/annotation/underline/add/Recent content in How to add Underline Annotati......com/pdf/cpp/annotation/underline/add/Recent...+0000https://products.aspose.com/pdf/cpp/annotation/underline/add/index...