Are you sure? I believe it's quite opposite - bsf.jar was present in FOP
distribution till 0.20.5rc release, when it was removed as unused anymore.
XSL-FO Rec doesn't support this, hence FOP too. I believe it could be
implemented as XSL-FO extension though.
The newest fop (not sure if the earlier did this) imports bsf.jar, any
idea why that's being used?
Multiconn Technologies, Israel
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list