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    • 79. 发明授权
    • Routing XML queries
    • 路由XML查询
    • US07664806B1
    • 2010-02-16
    • US10830285
    • 2004-04-22
    • Nikolaos KoudasDivesh SrivastavaMichael Rabinovich
    • Nikolaos KoudasDivesh SrivastavaMichael Rabinovich
    • G06F7/00G06F15/16
    • G06F17/30929G06F17/30545
    • A vast amount of information currently accessible over the Web, and in corporate networks, is stored in a variety of databases, and is being exported as XML data. However, querying this totality of information in a declarative and timely fashion is problematic because this set of databases is dynamic, and a common schema is difficult to maintain. The present invention provides a solution to the problem of issuing declarative, ad hoc XPath queries against such a dynamic collection of XML databases, and receiving timely answers. There is proposed a decentralized architectures, under the open and the agreement cooperation models between a set of sites, for processing queries and updates to XML data. Each site consists of XML data nodes. (which export their data as XML, and also pose queries) and one XML router node (which manages the query and update interactions between sites). The architectures differ in the degree of knowledge individual router nodes have about data nodes containing specific XML data. There is therefore provided a method for accessing data over a wide area network comprising: providing a decentralized architecture comprising a plurality of data nodes each having a database, a query processor and a path index, and a plurality of router nodes each having a routing state, maintaining a routing state in each of the router nodes, broadcasting routing state updates from each of the databases to the router nodes, routing path queries to each of the databases by accessing the routing state.
    • 目前可以通过Web和企业网络访问的大量信息存储在各种数据库中,并作为XML数据导出。 然而,以声明和及时的方式查询这些信息是有问题的,因为这组数据库是动态的,并且常见的模式很难维护。 本发明提供了解决针对XML数据库的这种动态集合发出声明性特征XPath查询并及时接收答案的问题的解决方案。 提出了一种分散架构,在一组网站之间的开放协议合作模式下,用于处理查询和更新XML数据。 每个站点由XML数据节点组成。 (它们以XML格式导出数据,并提供查询)和一个XML路由器节点(管理查询和更新站点之间的交互)。 各种路由器节点对包含特定XML数据的数据节点的知识程度不同。 因此,提供了一种用于通过广域网访问数据的方法,包括:提供分散式架构,其包括多个数据节点,每个数据节点具有数据库,查询处理器和路径索引,以及多个路由器节点,每个节点具有路由状态 在每个路由器节点中保持路由状态,从每个数据库向路由器节点广播路由状态更新,通过访问路由状态将路由查询路由到每个数据库。