MarkupBlock - [0..30)::30 - [<foo><?xml foo bar baz?></foo>]
    MarkupTagBlock - [0..5)::5 - [<foo>]
        MarkupTextLiteral - [0..5)::5 - [<foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            Text;[foo];
            CloseAngle;[>];
    MarkupTextLiteral - [5..24)::19 - [<?xml foo bar baz?>] - Gen<Markup> - SpanEditHandler;Accepts:None
        OpenAngle;[<];
        QuestionMark;[?];
        Text;[xml];
        Whitespace;[ ];
        Text;[foo];
        Whitespace;[ ];
        Text;[bar];
        Whitespace;[ ];
        Text;[baz];
        QuestionMark;[?];
        CloseAngle;[>];
    MarkupTagBlock - [24..30)::6 - [</foo>]
        MarkupTextLiteral - [24..30)::6 - [</foo>] - Gen<Markup> - SpanEditHandler;Accepts:None
            OpenAngle;[<];
            ForwardSlash;[/];
            Text;[foo];
            CloseAngle;[>];
