Digital City is one of information nodes of the construction of Digital Earth and is the base of Digital Earth.
数字城市是数字地球建设中的一个信息节点，又是数字地球的基础。
Besides, the expansion of RDBMS, the navigational tools based on diagram-matching and the nonlinear linking between information nodes are disserted emphatically.
着重论述了关系型数据库管理系统的扩充、基于图形模糊匹配的导航工具、信息节点间非线性链接等技术要点。
On the other hand, important specifications such as the Infoset (a formal model of the information nodes in an XML document) should be established at the foundations.
另一方面，象Infoset (XML文档中信息节点的正式模型)这样的重要规范应该建立在此基础上。
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