Tango xml , failure of append node to parsed document

[yidabu]

Code:
        char[] content = "<a><b>B</b></a>";

        auto doc = new Document!(char);
        doc.parse(content);

        auto printer = new DocPrinter!(char);
        Stdout(printer(doc)).newline;///

        doc.root.firstChild.element(null, "c", "C");
        Stdout( printer(doc) ).newline;/// "<a><b>B</b></a>", c node not created, 

failure of append node c to doc, how to fix this?


-- 
yidabu <yidabu.spam at gmail.com>
http://www.dsource.org/projects/dwin

D 语言-中文(D Chinese):
http://www.d-programming-language-china.org/
http://bbs.d-programming-language-china.org/
http://dwin.d-programming-language-china.org/
http://scite4d.d-programming-language-china.org/