Problems with footnotes in term of varlistentry

It happened that I used the following construct (without
much thinking 
about the consequences):

  <variablelist>
    <varlistentry id="btn-down">
     
<term><guibutton>Runter</guibutton><foo
tnote>
      <para>Hitting <xref
linkend="btn-down"/> blabla ... </para>
      </footnote></term>

      <listitem>
        <para>blabla </para>
      </listitem>
    </varlistentry>
  </variablelist>

  ... (several pages between)

  <para>As against using <xref
linkend="btn-down"/> blabla ... </para>

[A]
OK, the use of the 1st xref is a clear mistake caused by me.
All 
transformers crashed when processing the FO stylesheets
(xalan produces 
a stack overflow, xsltproc did never come back, with saxon I
don't know 
anymore, what the console said) and it was very hard to find
the 
problem, because the document validates and after crashing,
you don't 
get a clue, what's wrong, not even by looking into the
incomplete FO 
fragment, that was produced by xalan. What astonished me:
the HTML 
stylesheets don't seem to have problems with this
construct.

Is it possible to modify the stylesheet in that way, that it
can 
recognize running into an infinite loop caused by a circular
reference? 
Or is it even possible to check this in RNG (don't know
much about it, 
only that it can express stricter checks than DTD).

[B]
The generated text for the second xref contains a
footnotemark. Can this 
be avoided? If the reference appears on a different side
than the term, 
even the footnote text itself is displayed a second time.

Thanks,
Georges

--
Using DTD 4.4 and stylesheet version1.70.0

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