商品房房屋买卖协议怎么写有法律效力出卖方(甲方)：_____国籍：___________________身份证号：__________地址：_______________XX编码：__________联系电话：_____________买受方(乙方)：_______国籍：_______________身份证号：____________地址：_______________XX编码：__________联系电话：_______________甲、乙双方就房屋买卖事项在平等自愿，协商一致前提