This element allows the programmer to take a set of nodes, group it by some criteria, and then process each group formed by that selection process.
这个元素允许程序员获取一组节点，按某些标准来进行分组，然后处理由那一选择过程组成的每一个组。
Selection pages are often composed of one or more selection components that let the user select criteria by which a data set is viewed by constrained list components.
选择页面通常由一个或多个允许用户选择条件的选择组件构成。受限列表组件根据这些条件查看数据集。
Upon completion of the query a result set is returned containing all of the records that met the selection criteria.
查询完成后，将返回一个结果集，其中包含满足选择条件的所有记录。
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