Aspose::Words::Markup::StructuredDocumentTag::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++....structured document tag. auto doc = MakeObject < Document > (); //...// Insert a plain text structured document tag of the "PlainText"...