| With the fast development of software technology and Internet, the traditional two-tier Client/Server structure cannot meet the requirement of distributing, expansibility and heterogeneity in enterprise computing. In three-tier or multi-tier system framework, with the business logic separated from the Client layer, the expansibility and transplantation of the system is increased. This framework is more and more popular now in enterprise systems applications.XML-based Web Services can encapsulate information, action, the representation of data and business process uniformly. With this technology, the enterprises can pack their e-business as components and then integrate these components dynamically according to the business process. Thus, Web Services provide effective technical support to the implementation of dynamic e-business.Simple Object Access Protocol is the simple protocol of information exchange in dispersive or distributive circumstances, and it is XML-based protocol.In this paper, the Web Services, XML and SOAP are introduced as first. With the development of information systems of a large institute of survey design as background, the development of Contract Ml sub-system is discussed in detail, and the application of XML in Web-based MIS is researched. According to the software engineering standard, in Contract Ml sub-system, system analysis, design and realization processing are described, and the system structure, MVC design pattern, DataBase and interface design of XML-based Contract Ml sub-system are given, the method of Ml sub-system deployed on the J2EE server BEA Weblogic is given as well. XML-RPC, XML Messaging transfer model and other key technologies are discussed, and the application of SOAP technology in Contract Ml sub-system is also researched.Based on the project development practice, the application of XML, SOAP and other technologies in enterprise MIS are researched, which will be valuable to develop enterprise application.
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