epigraph is not offset

epigraph is not offset properly in either XHTML or FO.
<https://sourceforge.net/tracker/?func=detail&atid=373747&aid=1063986&group_id=21935>

In XHTML, the solution turned out to be CSS:

/* epigraph: flush right, large left margin */
.epigraph { text-align: right; margin-left: 50%; }

what do I do to achieve a similar effect with FO?

Thanks!

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