【摘要】 该文提出了分布式ＷＷＷ（ｗｏｒｌｄ－ｗｉｄｅｗｅｂ）数据源ＷＷＷＤＳ（ＷＷＷｄａｔａｓｏｕｒｃｅｓ）概念，详细介绍了ＷＷＷＤＳ的数据模型．该数据模型包括节点、节点容器、节点图和链接点等，简单且具有扩展性，同时提出相应的查询能力强的查询语言ＷＷＷＱＬ（ＷＷＷｑｕｅｒｙｌａｎｇｕａｇｅ），并进一步探讨了查询处理和优化问题．更多还原

【Abstract】 In this paper, the concept of global distributed data sources over WWW(WWWDS) is introduced. A simple and extensible data model based on node, node container, node graph and link points are discussed in details. A powerful SQL like query language (WWWQL) for WWWDS is introduced and the query processing and optimization technology for WWWQL are discussed as well.更多还原