footnote mark rendering with 1.77.1 stylesheets

hi,

I am having a problem with footnote mark rendering with the 1.77.1 stylesheets.

The actual footnote is rendered correctly, including the backreference to the footnote marker;

the problem is with the inline rendering of the footnote mark.

Details:

I render the footnote example from the doc 

http://www.docbook.org/tdg5/en/html/footnote.html

and I'm using the html/chunk.xsl stylesheet with no customization (xsltproc on freebsd 8):

The rendered footnote mark is structured like this:

----------------

<a href="" class="footnote">

  <sup class="footnote"></sup>

</a>

<a name="id286817273"></a>

[1] will be charged etc...

----------------

I think the '[1]' should be inside the 'sup' tag. 

However, as far as I can tell, the html/footnotes.xsl seems to be correct.

Is that a bug?

thanks,

--Tim