| Extensible Markup Language (XML), a new Internet-oriented markup language, was put forward by W3C (World Wide Web Consortinum) in February 1998. As an improvement of SGML (Standard Generalized Markup Language), XML has many advantages, such as good extensibility,self-description, content-presentation separation, comforming to rigid grammar definition and supporting multi-language, which makes it a novel technology in the fields of data exchange.An advanced management information system (MIS),Having accurate EDI both inside and between trading partners (there should be inside EDI. Have it with the accurate EDI among the trading partners too), can fulfil the advantages of MIS, efficiency, veracity etc. it makes data exchange between data sources having different structure come true to adopt XML as the data media of data exchange among Business Systems. The modularization of data conversion technologies between XML and Relational Database can improve reuse, expansibility and maintainability of data conversion technologies.Considering the basic requirement of bill of document exchange among the business systems and combining Object-Oriented (00) and software component technologies, this paper has designed and realized the general data convert system based on XML. We use standard XML module to express the data exchange and design the converting script XML file to describe the reflection relation between relational module and XML module. Here, The design and actualization of data converting component exchanging data format betweenrelational database and XML document are discussed, and, based on DOM parser, data converting algorithms inside the components of both server end and client end are introduced in detail.While concretely implementing these algorithms, as long as we produce an simple and intuitionistic converting script for each kind of bill document, and call the data converting component interfaces , we can easily draw ( or store ) the XML files with hiberarchy relation.
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