# File lib/maruku/ext/math/to_html.rb, line 47
        def render_mathml(kind, tex)
                engine = get_setting(:html_math_engine)
                method = "convert_to_mathml_#{engine}".to_sym
                if self.respond_to? method
                        mathml = self.send(method, kind, tex) 
                        return mathml || convert_to_mathml_none(kind, tex)
                else 
                        puts "A method called #{method} should be defined."
                        return convert_to_mathml_none(kind, tex)
                end
        end