Aspose::Words::Notes::Footnote::get_ReferenceMark method. Gets/sets custom reference mark to be used for this footnote. Default value is empty string, meaning auto-numbered footnotes are used in C++....Aspose::Words::Notes::Footnote::get_ReferenceMark method. Gets/sets custom reference mark to be used for this footnote. Default value is empty string, meaning auto-numbered footnotes are used in C++.