+ void normalize(NormalStream &) const;
+ ///
+ void validate(LaTeXFeatures & features) const;
+ ///
+ void maple(MapleStream &) const;
+ ///
+ void mathematica(MathematicaStream &) const;
+ ///
+ void octave(OctaveStream &) const;
+ ///
+ void write(WriteStream & os) const;