<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div> Another obvious downside</div><div>is that users who write cell_magics have to return NotebookNode instances (which doesn&#39;t seem too difficult).</div>
</blockquote><div><br></div><div>I guess cell_magics would only have to return NotebookNode instances if composition were to work. </div></div><div><br></div>-- <br>Jonathan Taylor                          <br>Dept. of Statistics                      <br>
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