@Edent the Z39.98 Daisy spec has semantics for roman characters: epub:type="z3998:roman". No idea if anything supports that though. https://daisy.org/activities/standards/daisy/z39-98-2012/z39-98-2012-structural-semantics-vocabulary/#roman
Z39.98-2012 Structural Semantics Vocabulary - The DAISY Consortium