A Framework Research base on the XML and the Metadata

the metadata occupies an important place in the data base and OLAP system.Because of the importance of the metadata,it was extended to the exploitation and was abstracted a frame model.Any data related to the tools was stored in the metadata base in the form of metadata,and the metadata will drive the operation of the tasks.It will make the exploder focus on designing the metadata and its style of relative tools,which makes the process of designing easier,and enforce the flexibility and extension of the system.