xsl/xhtml: IDs into the generated index

consider this mouthful:

<firstterm><emphasis role="first"><function>CLOS:NO-PRIMARY-METHOD</function></emphasis>
 <indexterm id="no-prim-meth" significance="preferred"><primary id="no-prim-meth-i"><function>NO-PRIMARY-METHOD</function></primary></indexterm></firstterm>

and
 
<index id="idx"></index>

I want to be able to write (elsewhere)

        idx.html#no-prim-meth-i

to refer the users to the location of NO-PRIMARY-METHOD in the index.
Unfortunately, the ID of the element `primary' is not passed into the
file idx.html.
Is this a known bug?
What can I do?

-- 
Sam Steingold (http://www.podval.org/~sds) running RedHat9 GNU/Linux
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