+ void mathmlize(MathMLStream &) const override;
+ ///
+ void htmlize(HtmlStream &) const override;
+ ///
+ void validate(LaTeXFeatures & features) const override;
+ ///
+ InsetCode lyxCode() const override { return MATH_XARROW_CODE; }
+ ///
+ MathClass mathClass() const override { return MC_REL; }