[xsl] fo:inline baseline-shift that doesn't change line-height

[Karl Stubsjoen <kstubs@xxxxxxxxx>]

This is probably an easy answer, but how do you create an fo:inline
with a shifted baseline that does not impact the characteristics of
the existing line of text?  In other words, I want superscript text
but I do not want the line height to increase to accommodate for the
superscript.

Thanks,
Karl..