MarkupBlock - [0..21)::21 - [<text foo bar></text>]
    MarkupTagBlock - [0..14)::14 - [<text foo bar>]
        MarkupTransition - [0..14)::14 - Gen<None> - SpanEditHandler;Accepts:Any
            OpenAngle;[<];
            Text;[text];
            Whitespace;[ ];
            Text;[foo];
            Whitespace;[ ];
            Text;[bar];
            CloseAngle;[>];
    MarkupTagBlock - [14..21)::7 - [</text>]
        MarkupTransition - [14..21)::7 - Gen<None> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[text];
            CloseAngle;[>];
