XPath中如何比较不同类型的对象[2]

                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;

                }

            }