Research On Heterogeneous Data Integration Based On Ontology And XML

With the rapid development of Web, there are more and more resources in Internet which becomes a large and global information warehouse. The resource in Web not only include relational database, but also include html documents and xml documents. These scattering resources had been designed to satisfy the business need, and because of the difference between the software and hardware platform it excites heterogeneous phenomenon in these data source. It is hard to share and use the heterogeneous data source. The need of solving the integration problem of these heterogeneous data source becomes more important. However, the traditional data integration doesn't fit the demand. So, new data integration is expected to appear.The paper analyzed different kinds of data integration method, relevant theories and technologies of heterogeneous data integration, concluded that the semantic heterogeneity of data source need to resolve. Based on this, in order to resolve the semantic heterogeneity of data source, a kind of the heterogeneous data integration system framework based on Ontology and XML was proposed. The key technologies: XML, Ontology and Web Services were discussed. This paper mainly imported the concept of Ontology and XML to realize the integration of heterogeneous data.The main achievements of this paper were as follows:(1)The relevant theories and technologies of heterogeneous data integration were discussed. Analyzed the advantage of these technologies in heterogeneous data integration, concluded that the semantic heterogeneity of data source should to resolve.(2)Based on the technologies of XML, Ontology and Web Services, a kind of the heterogeneous data integration system framework based on Ontology and XML was proposed. The functions of components were designed in detail, and the key modules of the prototype system were tested.(3)The paper Used XML Schema to express the data source, and built the local ontology from XML Schema. XML technique can solve the problems of syntax heterogeneity.(4)In the paper, it defined global ontology, local ontology, the mapping between global ontology and local ontology, and the mapping between local ontology and data source. It used OWL language to express them. The integration scheme that mapping between global ontology and local ontology was put forward to solve the problems of semantic heterogeneity.(5)The method of wrapping data source to construct Web Services featured the prototype with the following good qualities, loose coupling, more flexibility and more extensibility. With this method, the seamless data integration can be exactly achieved.(6)Use XQuery language to express global query, which is easy to query XML. Then it decomposed the global query to local ontology.