pyRXP的元组树数据结构。
开源的 D2RQ 接口让您可以将关系数据当作一个三元组集合对待，因而该数据可以合并到这样的应用程序中。
The open source D2RQ interface lets you treat relational data as a collection of triples so that this data can be incorporated into such an application.
合并数据(不同的图)是一项简单操作，只需要建立包含图中所有三元组的集合。
Merging data (different graphs) is a simple operation that involves constructing a set of triples that includes all of the triples from the graphs.
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