Study Of Heterogeneous Data Exchange Technology On XML

In recent years, with the rapid development of Internet information industry, the amount of data showing explosive growth of database technology has been widely used, but because of the choice of data processing systems is the existence of various differences, making the data sources vary widely, forming a large heterogeneous database environment, how to share these heterogeneous data become the face of a difficult problem. XML technology has emerged in the subsequent exchange of data has demonstrated a powerful force, and quickly became a platform-independent, vendor-neutral data format standard, to overcome the EDI and other traditional data exchange with the format is not flexible, high cost, interactive poor and other shortcomings.This application of XML technology to build a data exchange model, using XML documents as data exchange carrier, and designed the exchange of XML-based document format rules for the dictionary, its translation rules with predefined commonconstraint transformation process, good solved the structure of the conversion process there is conflict, semantic conflict.Papers on database schema and XML schema of two-way conversion rule in-depth research, presented an object-based mapping methods to improve tree. Tree identified by the object database model with the XML document structure in the data mapping, schema mapping process to ensure the accuracy of the data structure, pattern of relationships retain the integrity of the primary keys, foreign keys, data types and default values and other semantic constraints conditions.The paper also established a database data and XML documents, databases, data types and XML Schema data type mapping rules of two aspects. Finally, the use of a database instance, there lational database and XML Schema documents the mapping between the two-way process was explained in detail.