boolean compareObjects(Object operand1,Object operand2,String operator)throws Exception{

        //both objects to be compared are node-sets

        if(both operand1 and operand2 are node-sets){

            Iterator i1 = operand1.iterator();

            Iterator i2 = operand2.iterator();

            while((node1 =i1.next()!=null){

                while((node2 =i2.next()!=null){

                    //convert node1 and node2 to string values

                    String s1 = (String)node1;

                    String s2 = (String)node2;

                    if(compareBasic(s1,s2,operator))return true;

                }

            }

        //neither object to be compared is a node-set

        }else if(neither operand1 nor operand2 is node-set){

             return compareBasic(operand1,operand2,operator);

        }else{

        //In this case, one object is node-set and the other is of basic type.Assume operand1 is node-set

            Iterator i1 = operand1.iterator();

            while((node1 =i1.next()!=null){

                if(operand2 is number)convert node1 to number as a new object named newOperand1

                if(operand2 is string)convert node1 to string as a new object named newOperand1

                if(operand2 is boolean)convert node1 to boolean as a new object named newOperand1

                if(compareBasic(newOperand1,operand2,operator))return true

            }

        }

        return false

    }

 

    boolean compareBasic(Object operand1, Object operand2, String operator) throws Exception{

        if (operator is "<=" or "<" or ">=" or ">"){

            convert operand1 and operand2 to number

            compare the two numbers with the operator;

        }else if("=".equals(operator)||"!=".equals(operator)){

            if(at least one object is boolean){convert the other object to boolean}

            if(at least one object is number){convert the other object to number}

            if(at least one object is string){convert the other object to string}

            compare the new two objects with "=" or "!="

        }else{

            throw new Exception("Doesn’t support this operator!");

        }

    }