MarkupBlock - [0..28)::28 - [<                      LF   ]
    MarkupTagBlock - [0..28)::28 - [<                      LF   ]
        MarkupTextLiteral - [0..28)::28 - [<                      LF   ] - Gen<Markup> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Whitespace;[                      ];
            NewLine;[LF];
            Whitespace;[   ];
