long lval2;
	long lval3;
	boolean numeric = val1 instanceof NumericValueExp;
	
	if (numeric) {
	    if (((NumericValueExp)val1).isLong()) {
		lval1 = ((NumericValueExp)val1).longValue();
		lval2 = ((NumericValueExp)val2).longValue();
		lval3 = ((NumericValueExp)val3).longValue();
		return lval2 <= lval1 && lval1 <= lval3;
	    } else {
		dval1 = ((NumericValueExp)val1).doubleValue();
		dval2 = ((NumericValueExp)val2).doubleValue();
		dval3 = ((NumericValueExp)val3).doubleValue();
		return dval2 <= dval1 && dval1 <= dval3;
	    }
	    
	} else {
	    sval1 = ((StringValueExp)val1).toString();
	    sval2 = ((StringValueExp)val2).toString();
	    sval3 = ((StringValueExp)val3).toString();
	    return sval2.compareTo(sval1) <= 0 && sval1.compareTo(sval3) <= 0;
	}
    } 
  
    /**
     * Returns the string representing the object.
     */   
    public String toString()  { 
	return "(" + exp1 + ") between (" + exp2 + ") and (" + exp3 + ")";
    } 

 }