public MmlSubtractExpr(MmlValueExpr left, MmlValueExpr right)
     : base(left, right)
 {
 }
 public MmlComparisonExpr(MmlValueExpr left, MmlValueExpr right, ComparisonType type)
 {
     Left = left;
     Right = right;
     ComparisonType = type;
 }
 public MmlParenthesizedExpr(MmlValueExpr content)
 {
     Content = content;
 }
 protected MmlArithmeticExpr(MmlValueExpr left, MmlValueExpr right)
 {
     Left = left;
     Right = right;
 }
 public MmlMultiplyExpr(MmlValueExpr left, MmlValueExpr right)
     : base(left, right)
 {
 }
 public MmlAddExpr(MmlValueExpr left, MmlValueExpr right)
     : base(left, right)
 {
 }
 public MmlModuloExpr(MmlValueExpr left, MmlValueExpr right)
     : base(left, right)
 {
 }
 public MmlDivideExpr(MmlValueExpr left, MmlValueExpr right)
     : base(left, right)
 {
 }
 public MmlConditionalExpr(MmlValueExpr condition, MmlValueExpr trueExpr, MmlValueExpr falseExpr)
 {
     Condition = condition;
     TrueExpr = trueExpr;
     FalseExpr = falseExpr;
 }