近年来，通信和网络技术的进步使得远程数据共享成为可能，大型组织对此兴趣浓厚，希望实现现有信息资源的高效透明交互，以提升业务效率。然而，当前的信息交换方式仍然原始，主要局限于由关系数据库和分布式计算系统技术规定的不结构化数据交换。现代企业计算环境通常是异构的，包含多种不兼容的数据库管理系统。
摘要：
Introduction Recent years have witnessed significant technological advances and developments in the areas of communication and networking technology which have created the possibility for remote data sharing and exchange over large distances. These technological advances have sparked increasing interest from large organizations which wish to make their existing, and currently disjoint, information resources interoperate efficiently and transparently in a way that guarantees that business is transacted more efficiently. Yet, the means for exchanging and sharing information are still primitive and largely constrained to exchanging relatively unstructured pieces of data as dictated by relational database and distributed computing systems technology. Today's corporate computing environments are typically heterogeneous, containing a variety of database management systems which are incompatible in syntax and semantics due to differences in their respective data models and corporate
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