The d4p_formattingDomain defines specializations for requesting specific formatting effects, such as a drop cap, bold and italic text, the tab character, inline equations, and so on.
Most elements of this domain are specializations of either p (and are block elements) or ph (and are inline elements). One is a specialization of foreign and one is a specialization of xref.
d4p_formattingDomain.ent and d4p_formattingDomain.mod