An information integrator instance that provides the capability to access distributed data without moving it to a central location 无需移动到中心位置即可访问分布式数据的information integrator实例
A data virtualization layer that provides transparent access to disparate and distributed data sources would meet this requirement 构建一个能够透明地访问异构和分布式数据源的数据虚拟化层，就可以实现上述要求。
A distributed transaction is a transaction that updates distributed data , that is , data on more than one networked computer system 分布式事务是用于更新分布式数据（即位于一个以上网络计算机系统上的数据）的事务。
Then , some new ideas and good implementation techniques for distributed data mining algorithms are proposed based on this prototype system 然后在这个原型系统模型的基础上，对分布式数据挖掘算法提出了一些新的思想和好的实现方法。
Additionally , the system has other advantages of j2ee technique , such as compatibility of different platform , the ability of reading distributed data and so on 此外，该系统继承了j2ee技术的其它优点，例如对不同平台的兼容性、对分布式数据的读取等。
The layer makes it possible to leverage the power of structured query language for doing search - query - retrieval operations over disparate and distributed data sources 抽象层可以利用结构化查询语言（ sql ）的能力，在异构分布式数据源上实现搜索-查询-获取操作。
It requires to integrate data to a fuller extent than ever before to share information in the distributed data environment , and support more and more complicated analytic application 分布式数据环境的信息交换和信息共享，复杂的分析型应用等都要求在前所未有的规模上集成数据。
Methods for federating multiple disparate , distributed data sources may also provide integration of data stored under differing schemas such as files and relational databases 用于联合多个相异的分布式数据源的方法可能还提供存储在不同模式下的数据的集成，比如文件和关系数据库。
Finally , a summation is given . main functions of data access middleware are location transparency , distributed data query , transaction process and heterogeneous data sources compatibility 数据服务中间件的主要功能包括数据的位置透明性、分布式数据查询、事务处理、异构数据源兼容。
In the end , this paper analysed one of the most important part : security system in detail . all the main technology used in the system r all particularly explained in this paper 本文采用xmlwebservices对分布式数据检索进行了分析研究,最后对系统中的安全性进行了详细的分析,并设计出一个整体安全体系结构方案。
