BO(Bussiness Object),PO(Persistent Object),VO(Value Object) 06-08-01 power1128 快被弄昏了，他们有些什么关系，又应该位于系统的那些层次上面
stormj 2006-08-01 14:55 VO; the Object contain or encapsulation DATA(values) and might be transfered between tiesBO: create the Transfer Object and returning it to the client upon request.PO: is responsible for the OJBECT's persistent(into DB,XML,files .....)