frac1.AXMathFractionDenominator.AXChildren.count=1
frac1.AXMathFractionDenominator.AXChildren[0].AXValue='2'
frac2.AXMathFractionDenominator=NULL
frac1.AXMathFractionDenominator.AXChildren.count=1
frac1.AXMathFractionDenominator.AXChildren[0].AXValue='2'
frac2.AXMathFractionDenominator=NULL