> The first case that can't be handled easily is when the author is
> mentioned in the text and the title in a footnote, leading to
> <bibl>
>   <author>Miller</author>
>   <note>See
>     <title>About ...</title>
>   </note>
> </bibl>
> which is still legal.
>
> However, as soon as there is more text between the author and the
> footnote mark, with markup that's not a children of bibl; or as soon
> as the footnote mentions an editor, this will fail because title and
> author can be children of note but not editor.

I'd apply two bibl elements and connect them using their IDs.

> A different way to handle this could be adding the author name near
> the title, just for the purpose of the bibl, within the footnote, but
> not rendering it. Is there fitting markup for such non-rendered
> additions? Is it simply <author rend='none'> and let the rendering
> backend worry about it?

Being academical, make sure that it is clear the transcriber added
text snippets on his own.

Karl