Aspose::Words::Markup::IStructuredDocumentTag::get_Placeholder method. Gets the BuildingBlock containing placeholder text which should be displayed when this SDT run contents are empty, the associated mapped XML element is empty as specified via the XmlMapping element or the IsShowingPlaceholderText element is true in C++....building block’s contents as a custom placeholder text for a structured..."PlainText" type, which will function as a text box. // The contents...