Research And Application On Meta Data Integration System

With the rapid development of information and network technologies, especially the appearance of dynamic alliance, e-supply chain and collaborative business, information exchange within or between enterprises occurs more frequently than ever. Information resource sharing has become one of the main basis of co-operation among modern enterprises. However, different meta-data models adopted by different systems and information systems are isomeric, which make semantic information sharing incompletely thereby impede information sharing greatly. Not only data sharing, but also semantic sharing of information at metadata level must be achieved within or between enterprises. As a result, research on metadata sharing and integration has been focused on in this field.Aiming at the problems mentioned above, the thesis presents the conception of metadata integration based on the overview of development and study on information system integration, laying stress on the strategy of metadata integration of CMMIS based on CWM and its corresponding integration system MDWIS. During the course of studying MDWIS, this thesis shows the system flow first, and then describes chief functional modules and key technologies in detail. With the information system of Daq Group as an example, the financial information sharing has been achieved based on metadata integration.The main contribution of the thesis includes:1. The conception of metadata is presented. In the process of information system integration, various components of ISC depend on metadata to describe the data they're intended to process and transform, in other word, metadata is responsible for providing structures and semantics which can fully understand data. Once the sharing strategy and mechanics are used, not only isomeric information sharing is achieved but quality of data is prominently promoted.2. An updated strategy of metadata integration is posed to further reduce integration cost. Based on public meta model of CWM, the updated strategy provides consistent understanding of each semantic of metadata. It can transform public and private meta model and doesn't need to build a metadata bridge between every metadata, which reduces entire cost.3. Based on the integration strategy mentioned above, we design a integration system of metadata depositary which is composed of metadata extraction, metadata modeling, metadata mapping, metadata transformation and metadata storage etc. Ruleson metadata mapping, transformation and storage are given in the thesis, therefore the system can integrate all sorts of metadata which makes the interoperation between metadata much easier. Finally, we apply the integration system to practical enterprise environment and realize data sharing and integration.