still trying to get a "nested" indent

i'm still having trouble specifying that i want to indent my
monospace verbatim environments by a certain distance, and have
that indent carry over into other elements.

  just now, i wanted to put a short <screen> section into a
tip admonition and, as with lists, i got


 [i]   Tip

       blah blah blah .. contents of tip ...
       ... more contents ...

    $ cat /etc/passwd

  IOW, the <screen> was indented, but only with respect to the very 
left of the page, not with respect to its position within the <tip>.

  my stylesheet fragment:

<xsl:attribute-set name="monospace.verbatim.properties">
 <xsl:attribute name="start-indent">0.25in</xsl:attribute>
</xsl:attribute-set>


  if i take this fragment out entirely, then the indent is lost,
of course, but it *does* take into account any containing element.

  what is the indentation customization i should be using?  confused.

rday