+ /// write content as MathML
+ virtual void mathmlize(MathStream &) const;
+ /// write content as HTML, best we can.
+ /// the idea for this, and some of the details, come from
+ /// eLyXer, written by Alex Fernandez. no code is borrowed. rather,
+ /// we try to mimic how eLyXer outputs some math.
+ virtual void htmlize(HtmlStream &) const;