added numerator and denominator (issue 65)
added numerator and denominator (issue 65)

yuriy-chumak/OL,yuriy-chumak/OL,aisamanra/owl-lisp,yuriy-chumak/OL,aisamanra/owl-lisp,aoh/owl-lisp,aoh/owl-lisp,yuriy-chumak/OL,aoh/owl-lisp,aisamanra/owl-lisp,yuriy-chumak/OL,yuriy-chumak/OL