...虚拟数据视图；可扩展标记语言；元数据 [gap=720]Key words：information integration；information resources；virtual data view；XML；meta-data ...
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Virtual View Data Integration Layer 虚拟视图数据集成层
A cloud can contain one or more virtual data Centers (VDC) - a representation of a user's view of available resources in a single virtual data center.
一个云可以包含一个或多个虚拟数据中心(VDC) -这是从用户角度所见的单个虚拟数据中心的所有可获取资源的展现。
When there are sales performance data being tracked in different cubes, a virtual cube provides a way to have the overall view by aggregating these separate cubes.
如果需要在不同的数据集中跟踪销售绩效数据，那么通过使用虚拟数据集合并各个数据集可以获得总体视图。
The focus of the federation pattern is to leave data in place and to provide a real-time, virtual, integrated view.
联合模式的重点是让数据保持在原来的位置，并提供实时的虚拟集成视图。
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