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显然能够在层次结构的实例的上下文中查询事实会很有价值。
It is clear that it would be valuable to be able to query the fact in the context of an instance of the hierarchy.
TreeModel负责某些任务，比如连接到数据源、延迟加载、以及从Tree小部件查询条目和条目层次结构。
TreeModel is in charge of certain tasks, such as connecting to the data source, lazy loading, and querying from the Tree widget about items and the hierarchy of items.
除了上述参考Cookbook中SAP BW对象和查询部分内所提及的指南以外，IBM Cognos 10为依赖时间的层次结构结构提供支持。
In addition to the guidelines noted within the SAP BW objects and queries section of the above referenced cookbook, IBM Cognos 10 provides support for time-dependent hierarchy structures.
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